VOcabulary for the IVOA Unified Content Descriptors (Version wd-1.0, 2008-05-08)
Arithmetic quantities
arith
Q: means that the word can be used indifferently as first or secondary word
Difference between two quantities described by the same UCD
arith.diff
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Numerical factor
arith.factor
P: means that the word can only be used as primary or first word
Gradient
arith.grad
P: means that the word can only be used as primary or first word
Rate (per time unit)
arith.rate
P: means that the word can only be used as primary or first word
Ratio between two quantities described by the same UCD
arith.ratio
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Zero point
arith.zp
Q: means that the word can be used indifferently as first or secondary word
Electromagnetic spectrum
em
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Channel / instrumental spectral bin coordinate (bin number)
em.bin
Q: means that the word can be used indifferently as first or secondary word
Energy value in the em frame
em.energy
Q: means that the word can be used indifferently as first or secondary word
Frequency value in the em frame
em.freq
Q: means that the word can be used indifferently as first or secondary word
Gamma rays part of the spectrum
em.gamma
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Hard gamma ray (>500 keV)
em.gamma.hard
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Soft gamma ray (120 - 500 keV)
em.gamma.soft
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Infrared part of the spectrum
em.IR
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Infrared between 15 and 30 micron
em.IR.15-30um
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Infrared between 30 and 60 micron
em.IR.30-60um
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Infrared between 3 and 4 micron
em.IR.3-4um
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Infrared between 4 and 8 micron
em.IR.4-8um
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Infrared between 60 and 100 micron
em.IR.60-100um
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Infrared between 8 and 15 micron
em.IR.8-15um
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Far-Infrared, 30-100 microns
em.IR.FIR
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Infrared between 1.5 and 2 micron
em.IR.H
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Infrared between 1.0 and 1.5 micron
em.IR.J
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Infrared between 2 and 3 micron
em.IR.K
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Medium-Infrared, 5-30 microns
em.IR.MIR
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Near-Infrared, 1-5 microns
em.IR.NIR
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Designation of major atomic lines
em.line
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Bracket gamma line
em.line.Brgamma
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
CO radio line, e.g. 12CO(1-0) rest wl 115GHz
em.line.CO
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
H-alpha line
em.line.Halpha
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
H-beta line
em.line.Hbeta
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
H-delta line
em.line.Hdelta
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
H-gamma line
em.line.Hgamma
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
21cm hydrogen line
em.line.HI
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
H-Lyalpha line
em.line.Lyalpha
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
[OIII] line whose rest wl is 500.7 nm
em.line.OIII
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Millimetric/submillimetric part of the spectrum
em.mm
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Millimetric between 100 and 200 GHz
em.mm.100-200GHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Millimetric between 1500 and 3000 GHz
em.mm.1500-3000GHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Millimetric between 200 and 400 GHz
em.mm.200-400GHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Millimetric between 30 and 50 GHz
em.mm.30-50GHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Millimetric between 400 and 750 GHz
em.mm.400-750GHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Millimetric between 50 and 100 GHz
em.mm.50-100GHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Millimetric between 750 and 1500 GHz
em.mm.750-1500GHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Optical part of the spectrum
em.opt
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Optical band between 400 and 500 nm
em.opt.B
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Optical band between 750 and 1000 nm
em.opt.I
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Optical band between 600 and 750 nm
em.opt.R
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Optical band between 300 and 400 nm
em.opt.U
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Optical band between 500 and 600 nm
em.opt.V
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Radio part of the spectrum
em.radio
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Radio between 100 and 200 MHz
em.radio.100-200MHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Radio between 12 and 30 GHz
em.radio.12-30GHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Radio between 1500 and 3000 MHz
em.radio.1500-3000MHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Radio between 200 and 400 MHz
em.radio.200-400MHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Radio between 20 and 100 MHz
em.radio.20-100MHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Radio between 3 and 6 GHz
em.radio.3-6GHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Radio between 400 and 750 MHz
em.radio.400-750MHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Radio between 6 and 12 GHz
em.radio.6-12GHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Radio between 750 and 1500 MHz
em.radio.750-1500MHz
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Ultraviolet part of the spectrum
em.UV
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Ultraviolet between 100 and 200 nm
em.UV.100-200nm
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Ultraviolet between 10 and 50 nm
em.UV.10-50nm
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Ultraviolet between 200 and 300 nm
em.UV.200-300nm
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Ultraviolet between 50 and 100 nm
em.UV.50-100nm
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Far-Ultraviolet
em.UV.FUV
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Wavenumber value in the em frame
em.wavenumber
Q: means that the word can be used indifferently as first or secondary word
Wavelength value in the em frame
em.wl
Q: means that the word can be used indifferently as first or secondary word
Central wavelength
em.wl.central
Q: means that the word can be used indifferently as first or secondary word
Effective wavelength
em.wl.effective
Q: means that the word can be used indifferently as first or secondary word
X-ray part of the spectrum
em.X-ray
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Hard X-ray (12 - 120 keV)
em.X-ray.hard
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Medium X-ray (2 - 12 keV)
em.X-ray.medium
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Soft X-ray (0.12 - 2 keV)
em.X-ray.soft
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Instrument
instr
Q: means that the word can be used indifferently as first or secondary word
Instrumental background
instr.background
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Bandpass (e.g.: band name) of instrument
instr.bandpass
Q: means that the word can be used indifferently as first or secondary word
Bandwidth of the instrument
instr.bandwidth
Q: means that the word can be used indifferently as first or secondary word
Baseline for interferometry
instr.baseline
Q: means that the word can be used indifferently as first or secondary word
Beam
instr.beam
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Calibration parameter
instr.calib
Q: means that the word can be used indifferently as first or secondary word
Detector
instr.det
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Instrument noise
instr.det.noise
Q: means that the word can be used indifferently as first or secondary word
Point Spread Function
instr.det.psf
Q: means that the word can be used indifferently as first or secondary word
Quantum efficiency
instr.det.qe
Q: means that the word can be used indifferently as first or secondary word
Dispersion of a spectrograph
instr.dispersion
Q: means that the word can be used indifferently as first or secondary word
Filter
instr.filter
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Field of view
instr.fov
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Observatory, satellite, mission
instr.obsty
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Seeing
instr.obsty.seeing
Q: means that the word can be used indifferently as first or secondary word
Offset angle respect to main direction of observation
instr.offset
Q: means that the word can be used indifferently as first or secondary word
Spectral order in a spectrograph
instr.order
Q: means that the word can be used indifferently as first or secondary word
Various instrumental parameters
instr.param
Q: means that the word can be used indifferently as first or secondary word
Pixel (default size: angular)
instr.pixel
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Photographic plate
instr.plate
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Plate emulsion
instr.plate.emulsion
Q: means that the word can be used indifferently as first or secondary word
Instrument precision
instr.precision
Q: means that the word can be used indifferently as first or secondary word
Instrument saturation threshold
instr.saturation
Q: means that the word can be used indifferently as first or secondary word
Instrument scale (for CCD, plate, image)
instr.scale
Q: means that the word can be used indifferently as first or secondary word
Instrument sensitivity, detection threshold
instr.sensitivity
Q: means that the word can be used indifferently as first or secondary word
Instrument configuration or setup
instr.setup
Q: means that the word can be used indifferently as first or secondary word
Sky level
instr.skyLevel
Q: means that the word can be used indifferently as first or secondary word
Sky temperature
instr.skyTemp
Q: means that the word can be used indifferently as first or secondary word
Telescope
instr.tel
Q: means that the word can be used indifferently as first or secondary word
Telescope focal length
instr.tel.focalLength
Q: means that the word can be used indifferently as first or secondary word
Metadata
meta
P: means that the word can only be used as primary or first word
Abstract (of paper, proposal,etc.)
meta.abstract
P: means that the word can only be used as primary or first word
Bibliographic reference
meta.bib
P: means that the word can only be used as primary or first word
Author name
meta.bib.author
P: means that the word can only be used as primary or first word
Bibcode
meta.bib.bibcode
P: means that the word can only be used as primary or first word
Figure in a paper
meta.bib.fig
P: means that the word can only be used as primary or first word
Journal name
meta.bib.journal
P: means that the word can only be used as primary or first word
Page number
meta.bib.page
P: means that the word can only be used as primary or first word
Volume number
meta.bib.volume
P: means that the word can only be used as primary or first word
Code or flag
meta.code
P: means that the word can only be used as primary or first word
Classification code
meta.code.class
P: means that the word can only be used as primary or first word
limit uncertainty error flag
meta.code.error
P: means that the word can only be used as primary or first word
Membership code
meta.code.member
P: means that the word can only be used as primary or first word
MIME type
meta.code.mime
P: means that the word can only be used as primary or first word
Multiplicity or binarity flag
meta.code.multip
P: means that the word can only be used as primary or first word
Quality, precision, reliability flag or code
meta.code.qual
P: means that the word can only be used as primary or first word
Status code (e.g.: status of a proposal/observation)
meta.code.status
P: means that the word can only be used as primary or first word
Unknown or impossible to understand quantity
meta.cryptic
P: means that the word can only be used as primary or first word
Identity of man/organization responsible for the data
meta.curation
P: means that the word can only be used as primary or first word
Dataset
meta.dataset
Q: means that the word can be used indifferently as first or secondary word
Curation/contact e-mail
meta.email
Q: means that the word can be used indifferently as first or secondary word
File
meta.file
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
FITS standard
meta.fits
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Identifier, name or designation
meta.id
P: means that the word can only be used as primary or first word
Identifier of associated counterpart
meta.id.assoc
P: means that the word can only be used as primary or first word
Name of Co-Investigator
meta.id.CoI
P: means that the word can only be used as primary or first word
Cross identification
meta.id.cross
P: means that the word can only be used as primary or first word
Identification of parent source
meta.id.parent
P: means that the word can only be used as primary or first word
Part of identifier, suffix or sub-component
meta.id.part
P: means that the word can only be used as primary or first word
Name of Principal Investigator
meta.id.PI
P: means that the word can only be used as primary or first word
Main value of something
meta.main
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Quantity was produced by a model
meta.modelled
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Note or remark (longer than a code or flag)
meta.note
P: means that the word can only be used as primary or first word
Number (of things; e.g. nb of object in an image)
meta.number
P: means that the word can only be used as primary or first word
Record number
meta.record
P: means that the word can only be used as primary or first word
Reference, or origin
meta.ref
P: means that the word can only be used as primary or first word
IVORN, Int. VO Resource Name (ivo://)
meta.ref.ivorn
Q: means that the word can be used indifferently as first or secondary word
URI, universal resource identifier
meta.ref.uri
Q: means that the word can be used indifferently as first or secondary word
URL, web address
meta.ref.url
P: means that the word can only be used as primary or first word
Software used in generating data
meta.software
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Table or catalogue
meta.table
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Title or explanation
meta.title
P: means that the word can only be used as primary or first word
UCD
meta.ucd
Q: means that the word can be used indifferently as first or secondary word
Unit
meta.unit
P: means that the word can only be used as primary or first word
Version
meta.version
P: means that the word can only be used as primary or first word
Observation
obs
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Airmass
obs.airMass
Q: means that the word can be used indifferently as first or secondary word
Atmosphere, atmospheric phenomena affecting an observation
obs.atmos
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Atmospheric extinction
obs.atmos.extinction
Q: means that the word can be used indifferently as first or secondary word
Atmospheric refraction angle
obs.atmos.refractAngle
Q: means that the word can be used indifferently as first or secondary word
Calibration observation
obs.calib
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Related to flat-field calibration observation (dome, sky, ..)
obs.calib.flat
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Exposure
obs.exposure
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Region covered by the observation
obs.field
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Image
obs.image
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Observer, discoverer
obs.observer
Q: means that the word can be used indifferently as first or secondary word
Various observation or reduction parameter
obs.param
Q: means that the word can be used indifferently as first or secondary word
Observation proposal
obs.proposal
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Proposal cycle
obs.proposal.cycle
Q: means that the word can be used indifferently as first or secondary word
Sequence of observations, exposures or events
obs.sequence
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Photometry
phot
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Antenna temperature
phot.antennaTemp
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Photometric calibration
phot.calib
Q: means that the word can be used indifferently as first or secondary word
Color index or magnitude difference
phot.color
C: is a colour index, and can be followed by two successive word describing a part of the electromagnetic spectrum
color excess
phot.color.excess
Q: means that the word can be used indifferently as first or secondary word
Dereddened color
phot.color.reddFree
Q: means that the word can be used indifferently as first or secondary word
Flux expressed in counts
phot.count
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
fluence
phot.fluence
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Photon flux
phot.flux
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Bolometric flux
phot.flux.bol
Q: means that the word can be used indifferently as first or secondary word
Flux density (per wl/freq/energy interval)
phot.flux.density
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Flux density surface brightness
phot.flux.density.sb
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Flux surface brightness
phot.flux.sb
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Limb-darkening coefficients
phot.limbDark
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Photometric magnitude
phot.mag
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Bolometric correction
phot.mag.bc
Q: means that the word can be used indifferently as first or secondary word
Bolometric magnitude
phot.mag.bol
Q: means that the word can be used indifferently as first or secondary word
Distance modulus
phot.mag.distMod
Q: means that the word can be used indifferently as first or secondary word
Dereddened magnitude
phot.mag.reddFree
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Surface brightness in magnitude units
phot.mag.sb
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Physical quantities
phys
Q: means that the word can be used indifferently as first or secondary word
Extinction or absorption along the line of sight
phys.absorption
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Absorption coefficient (e.g. in a spectral line)
phys.absorption.coeff
Q: means that the word can be used indifferently as first or secondary word
Galactic extinction
phys.absorption.gal
Q: means that the word can be used indifferently as first or secondary word
Optical depth
phys.absorption.opticalDepth
Q: means that the word can be used indifferently as first or secondary word
Abundance
phys.abund
Q: means that the word can be used indifferently as first or secondary word
Fe/H abundance
phys.abund.Fe
Q: means that the word can be used indifferently as first or secondary word
Hydrogen abundance
phys.abund.X
Q: means that the word can be used indifferently as first or secondary word
Helium abundance
phys.abund.Y
Q: means that the word can be used indifferently as first or secondary word
Metallicity abundance
phys.abund.Z
Q: means that the word can be used indifferently as first or secondary word
Acceleration
phys.acceleration
Q: means that the word can be used indifferently as first or secondary word
Albedo or reflectance
phys.albedo
Q: means that the word can be used indifferently as first or secondary word
Angular area
phys.angArea
Q: means that the word can be used indifferently as first or secondary word
Angular momentum
phys.angMomentum
Q: means that the word can be used indifferently as first or secondary word
Angular size width diameter dimension extension major minor axis extraction radius
phys.angSize
Q: means that the word can be used indifferently as first or secondary word
angular size extent or extension of semi-major axis
phys.angSize.smajAxis
Q: means that the word can be used indifferently as first or secondary word
angular size extent or extension of semi-minor axis
phys.angSize.sminAxis
Q: means that the word can be used indifferently as first or secondary word
Area (in linear units)
phys.area
Q: means that the word can be used indifferently as first or secondary word
Atomic and molecular physics (shared properties)
phys.atmol
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Branching ratio
phys.atmol.branchingRatio
Q: means that the word can be used indifferently as first or secondary word
Related to collisions
phys.atmol.collisional
Q: means that the word can be used indifferently as first or secondary word
Collisional strength
phys.atmol.collStrength
Q: means that the word can be used indifferently as first or secondary word
Configuration
phys.atmol.configuration
Q: means that the word can be used indifferently as first or secondary word
Atomic / molecular cross-section
phys.atmol.crossSection
Q: means that the word can be used indifferently as first or secondary word
Element
phys.atmol.element
Q: means that the word can be used indifferently as first or secondary word
Atomic molecular excitation parameter
phys.atmol.excitation
Q: means that the word can be used indifferently as first or secondary word
Quantity refers to atomic/molecular final/ground state, level, ecc.
phys.atmol.final
Q: means that the word can be used indifferently as first or secondary word
Quantity refers to atomic/molecular initial state, level, ecc.
phys.atmol.initial
Q: means that the word can be used indifferently as first or secondary word
Related to ionization
phys.atmol.ionization
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Ion, ionization stage
phys.atmol.ionStage
Q: means that the word can be used indifferently as first or secondary word
Lande factor
phys.atmol.lande
Q: means that the word can be used indifferently as first or secondary word
Atomic level
phys.atmol.level
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Lifetime of a level
phys.atmol.lifetime
Q: means that the word can be used indifferently as first or secondary word
Line shifting coefficient
phys.atmol.lineShift
Q: means that the word can be used indifferently as first or secondary word
Atomic number Z
phys.atmol.number
Q: means that the word can be used indifferently as first or secondary word
Oscillator strength
phys.atmol.oscStrength
Q: means that the word can be used indifferently as first or secondary word
Parity
phys.atmol.parity
Q: means that the word can be used indifferently as first or secondary word
Quantum number
phys.atmol.qn
Q: means that the word can be used indifferently as first or secondary word
Type of radiation characterizing atomic lines (electric dipole/quadrupole, magnetic dipole)
phys.atmol.radiationType
Q: means that the word can be used indifferently as first or secondary word
Statistical weight
phys.atmol.sWeight
Q: means that the word can be used indifferently as first or secondary word
Statistical weight for nuclear spin states
phys.atmol.sWeight.nuclear
Q: means that the word can be used indifferently as first or secondary word
Type of nuclear spin symmetry
phys.atmol.symmetry
Q: means that the word can be used indifferently as first or secondary word
Atomic term
phys.atmol.term
Q: means that the word can be used indifferently as first or secondary word
Transition between states
phys.atmol.transition
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Transition probability, Einstein A coefficient
phys.atmol.transProb
Q: means that the word can be used indifferently as first or secondary word
Atomic weight
phys.atmol.weight
Q: means that the word can be used indifferently as first or secondary word
Weighted oscillator strength
phys.atmol.wOscStrength
Q: means that the word can be used indifferently as first or secondary word
Column density
phys.columnDensity
Q: means that the word can be used indifferently as first or secondary word
Quantities related to composition of objects
phys.composition
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Mass to light ratio
phys.composition.massLightRatio
Q: means that the word can be used indifferently as first or secondary word
Mass yield
phys.composition.yield
Q: means that the word can be used indifferently as first or secondary word
Related to cosmology
phys.cosmology
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Generic damping quantities
phys.damping
Q: means that the word can be used indifferently as first or secondary word
Density (of mass, electron, ...)
phys.density
Q: means that the word can be used indifferently as first or secondary word
Complex dielectric function
phys.dielectric
Q: means that the word can be used indifferently as first or secondary word
Dispersion measure
phys.dispMeasure
Q: means that the word can be used indifferently as first or secondary word
Electric field
phys.electField
V: stands for vector. Such a word can be followed by another describing the axis or reference frame in which the measurement is done
Electron
phys.electron
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Electron degeneracy parameter
phys.electron.degen
Q: means that the word can be used indifferently as first or secondary word
Emissivity
phys.emissivity
Q: means that the word can be used indifferently as first or secondary word
Emission measure
phys.emissMeasure
Q: means that the word can be used indifferently as first or secondary word
Energy
phys.energy
Q: means that the word can be used indifferently as first or secondary word
Energy-density
phys.energy.density
Q: means that the word can be used indifferently as first or secondary word
Entropy
phys.entropy
Q: means that the word can be used indifferently as first or secondary word
Equation of state
phys.eos
Q: means that the word can be used indifferently as first or secondary word
Excitation parameter U
phys.excitParam
Q: means that the word can be used indifferently as first or secondary word
Gaunt factor/correction
phys.gauntFactor
Q: means that the word can be used indifferently as first or secondary word
Gravity
phys.gravity
Q: means that the word can be used indifferently as first or secondary word
Ionization parameter
phys.ionizParam
Q: means that the word can be used indifferently as first or secondary word
Collisional ionization
phys.ionizParam.coll
Q: means that the word can be used indifferently as first or secondary word
Radiative ionization
phys.ionizParam.rad
Q: means that the word can be used indifferently as first or secondary word
Luminosity
phys.luminosity
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Luminosity function
phys.luminosity.fun
Q: means that the word can be used indifferently as first or secondary word
Absolute magnitude
phys.magAbs
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Bolometric absolute magnitude
phys.magAbs.bol
Q: means that the word can be used indifferently as first or secondary word
Magnetic field
phys.magField
V: stands for vector. Such a word can be followed by another describing the axis or reference frame in which the measurement is done
Mass
phys.mass
Q: means that the word can be used indifferently as first or secondary word
Mass loss
phys.mass.loss
Q: means that the word can be used indifferently as first or secondary word
Molecular data
phys.mol
Q: means that the word can be used indifferently as first or secondary word
Molecular dipole
phys.mol.dipole
Q: means that the word can be used indifferently as first or secondary word
Molecular electric dipole moment
phys.mol.dipole.electric
Q: means that the word can be used indifferently as first or secondary word
Molecular magnetic dipole moment
phys.mol.dipole.magnetic
Q: means that the word can be used indifferently as first or secondary word
Molecular dissociation
phys.mol.dissociation
Q: means that the word can be used indifferently as first or secondary word
Formation heat for molecules
phys.mol.formationHeat
Q: means that the word can be used indifferently as first or secondary word
Molecular quadrupole
phys.mol.quadrupole
Q: means that the word can be used indifferently as first or secondary word
Molecular electric quadrupole moment
phys.mol.quadrupole.electric
Q: means that the word can be used indifferently as first or secondary word
Molecular rotation
phys.mol.rotation
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Molecular vibration
phys.mol.vibration
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Related to neutrino
phys.particle.neutrino
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Polarization degree (or percentage)
phys.polarization
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Circular polarization
phys.polarization.circular
Q: means that the word can be used indifferently as first or secondary word
Linear polarization
phys.polarization.linear
Q: means that the word can be used indifferently as first or secondary word
Rotation measure polarization
phys.polarization.rotMeasure
Q: means that the word can be used indifferently as first or secondary word
Stokes polarization
phys.polarization.stokes
Q: means that the word can be used indifferently as first or secondary word
Pressure
phys.pressure
Q: means that the word can be used indifferently as first or secondary word
Recombination coefficient
phys.recombination.coeff
Q: means that the word can be used indifferently as first or secondary word
Refraction index
phys.refractIndex
Q: means that the word can be used indifferently as first or secondary word
Star formation rate
phys.SFR
Q: means that the word can be used indifferently as first or secondary word
Linear size, length (not angular)
phys.size
Q: means that the word can be used indifferently as first or secondary word
Axis ratio (a/b) or (b/a)
phys.size.axisRatio
Q: means that the word can be used indifferently as first or secondary word
Linear diameter
phys.size.diameter
Q: means that the word can be used indifferently as first or secondary word
Linear radius
phys.size.radius
Q: means that the word can be used indifferently as first or secondary word
Linear semi major axis
phys.size.smajAxis
Q: means that the word can be used indifferently as first or secondary word
Linear semi minor axis
phys.size.sminAxis
Q: means that the word can be used indifferently as first or secondary word
Temperature
phys.temperature
Q: means that the word can be used indifferently as first or secondary word
Effective temperature
phys.temperature.effective
Q: means that the word can be used indifferently as first or secondary word
Electron temperature
phys.temperature.electron
Q: means that the word can be used indifferently as first or secondary word
Transmission (of filter, instrument, ...)
phys.transmission
Q: means that the word can be used indifferently as first or secondary word
Space velocity
phys.veloc
V: stands for vector. Such a word can be followed by another describing the axis or reference frame in which the measurement is done
Angular velocity
phys.veloc.ang
Q: means that the word can be used indifferently as first or secondary word
Velocity dispersion
phys.veloc.dispersion
Q: means that the word can be used indifferently as first or secondary word
Escape velocity
phys.veloc.escape
Q: means that the word can be used indifferently as first or secondary word
Expansion velocity
phys.veloc.expansion
Q: means that the word can be used indifferently as first or secondary word
Microturbulence velocity
phys.veloc.microTurb
Q: means that the word can be used indifferently as first or secondary word
Orbital velocity
phys.veloc.orbital
Q: means that the word can be used indifferently as first or secondary word
Pulsational velocity
phys.veloc.pulsat
Q: means that the word can be used indifferently as first or secondary word
Rotational velocity
phys.veloc.rotat
Q: means that the word can be used indifferently as first or secondary word
Transverse / tangential velocity
phys.veloc.transverse
Q: means that the word can be used indifferently as first or secondary word
Related to virial quantities (mass, radius, ..)
phys.virial
Q: means that the word can be used indifferently as first or secondary word
Position and coordinates
pos
Q: means that the word can be used indifferently as first or secondary word
Angular distance, elongation
pos.angDistance
Q: means that the word can be used indifferently as first or secondary word
Angular resolution
pos.angResolution
Q: means that the word can be used indifferently as first or secondary word
Position in alt-azimutal frame
pos.az
Q: means that the word can be used indifferently as first or secondary word
Alt-azimutal altitude
pos.az.alt
Q: means that the word can be used indifferently as first or secondary word
Alt-azimutal azimut
pos.az.azi
Q: means that the word can be used indifferently as first or secondary word
Alt-azimutal zenith distance
pos.az.zd
Q: means that the word can be used indifferently as first or secondary word
Barycenter
pos.barycenter
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Body related coordinates
pos.bodyrc
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Body related coordinate (altitude on the body)
pos.bodyrc.alt
Q: means that the word can be used indifferently as first or secondary word
Body related coordinate (latitude on the body)
pos.bodyrc.lat
Q: means that the word can be used indifferently as first or secondary word
Body related coordinate (longitude on the body)
pos.bodyrc.long
Q: means that the word can be used indifferently as first or secondary word
Cartesian (rectangular) coordinates
pos.cartesian
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Cartesian coordinate along the x-axis
pos.cartesian.x
Q: means that the word can be used indifferently as first or secondary word
Cartesian coordinate along the y-axis
pos.cartesian.y
Q: means that the word can be used indifferently as first or secondary word
Cartesian coordinate along the z-axis
pos.cartesian.z
Q: means that the word can be used indifferently as first or secondary word
Cosmic Microwave Background reference frame
pos.cmb
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Direction cosine
pos.dirCos
Q: means that the word can be used indifferently as first or secondary word
Linear distance
pos.distance
V: stands for vector. Such a word can be followed by another describing the axis or reference frame in which the measurement is done
Coordinates related to Earth
pos.earth
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Altitude, height on Earth above sea level
pos.earth.altitude
Q: means that the word can be used indifferently as first or secondary word
Latitude on Earth
pos.earth.lat
Q: means that the word can be used indifferently as first or secondary word
Longitude on Earth
pos.earth.lon
Q: means that the word can be used indifferently as first or secondary word
Ecliptic coordinates
pos.ecliptic
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Ecliptic latitude
pos.ecliptic.lat
Q: means that the word can be used indifferently as first or secondary word
Ecliptic longitude
pos.ecliptic.lon
Q: means that the word can be used indifferently as first or secondary word
Earth orientation parameters
pos.eop
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Earth nutation
pos.eop.nutation
Q: means that the word can be used indifferently as first or secondary word
Ephemeris
pos.ephem
Q: means that the word can be used indifferently as first or secondary word
Equatorial coordinates
pos.eq
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Declination in equatorial coordinates
pos.eq.dec
Q: means that the word can be used indifferently as first or secondary word
Hour-angle
pos.eq.ha
Q: means that the word can be used indifferently as first or secondary word
Right ascension in equatorial coordinates
pos.eq.ra
Q: means that the word can be used indifferently as first or secondary word
South polar distance in equatorial coordinates
pos.eq.spd
Q: means that the word can be used indifferently as first or secondary word
Positional error ellipse
pos.errorEllipse
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Reference frame used for positions
pos.frame
Q: means that the word can be used indifferently as first or secondary word
Galactic coordinates
pos.galactic
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Latitude in galactic coordinates
pos.galactic.lat
Q: means that the word can be used indifferently as first or secondary word
Longitude in galactic coordinates
pos.galactic.lon
Q: means that the word can be used indifferently as first or secondary word
Galactocentric coordinate system
pos.galactocentric
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Geocentric coordinate system
pos.geocentric
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Hierarchical Equal Area IsoLatitude Pixelization
pos.healpix
Q: means that the word can be used indifferently as first or secondary word
Heliocentric position coordinate (solar system bodies)
pos.heliocentric
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Hierarchical Triangular Mesh
pos.HTM
Q: means that the word can be used indifferently as first or secondary word
Lambert projection
pos.lambert
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Local Group reference frame
pos.lg
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Local Standard of Rest reference frame
pos.lsr
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Lunar coordinates
pos.lunar
Q: means that the word can be used indifferently as first or secondary word
Occultation by lunar limb
pos.lunar.occult
Q: means that the word can be used indifferently as first or secondary word
Parallax
pos.parallax
Q: means that the word can be used indifferently as first or secondary word
Dynamical parallax
pos.parallax.dyn
Q: means that the word can be used indifferently as first or secondary word
Photometric parallaxes
pos.parallax.phot
Q: means that the word can be used indifferently as first or secondary word
Spectroscopic parallax
pos.parallax.spect
Q: means that the word can be used indifferently as first or secondary word
Trigonometric parallax
pos.parallax.trig
Q: means that the word can be used indifferently as first or secondary word
Phase angle, e.g. elongation of earth from sun as seen from a third cel. object
pos.phaseAng
Q: means that the word can be used indifferently as first or secondary word
Proper motion
pos.pm
V: stands for vector. Such a word can be followed by another describing the axis or reference frame in which the measurement is done
Position angle of a given vector
pos.posAng
Q: means that the word can be used indifferently as first or secondary word
Precession (in equatorial coordinates)
pos.precess
V: stands for vector. Such a word can be followed by another describing the axis or reference frame in which the measurement is done
Supergalactic coordinates
pos.supergalactic
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Latitude in supergalactic coordinates
pos.supergalactic.lat
Q: means that the word can be used indifferently as first or secondary word
Longitude in supergalactic coordinates
pos.supergalactic.lon
Q: means that the word can be used indifferently as first or secondary word
WCS keywords
pos.wcs
P: means that the word can only be used as primary or first word
WCS CDMATRIX
pos.wcs.cdmatrix
P: means that the word can only be used as primary or first word
WCS CRPIX
pos.wcs.crpix
P: means that the word can only be used as primary or first word
WCS CRVAL
pos.wcs.crval
P: means that the word can only be used as primary or first word
WCS CTYPE
pos.wcs.ctype
P: means that the word can only be used as primary or first word
WCS NAXES
pos.wcs.naxes
P: means that the word can only be used as primary or first word
WCS NAXIS
pos.wcs.naxis
P: means that the word can only be used as primary or first word
WCS scale or scale of an image
pos.wcs.scale
P: means that the word can only be used as primary or first word
Spectroscopy
spect
Q: means that the word can be used indifferently as first or secondary word
Spectral bin size
spect.binSize
Q: means that the word can be used indifferently as first or secondary word
Continuum spectrum
spect.continuum
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Doppler parameter b
spect.dopplerParam
Q: means that the word can be used indifferently as first or secondary word
Radial velocity, derived from the shift of some spectral feature
spect.dopplerVeloc
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Radial velocity derived from a wavelength shift using the optical convention
spect.dopplerVeloc.opt
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Radial velocity derived from a frequency shift using the radio convention
spect.dopplerVeloc.radio
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Spectral index
spect.index
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Spectral line
spect.line
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Line asymmetry
spect.line.asymmetry
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Spectral line broadening
spect.line.broad
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Stark line broadening coefficient
spect.line.broad.Stark
Q: means that the word can be used indifferently as first or secondary word
Zeeman broadening
spect.line.broad.Zeeman
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Line equivalent width
spect.line.eqWidth
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Line intensity
spect.line.intensity
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Line profile
spect.line.profile
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Spectral line strength S
spect.line.strength
Q: means that the word can be used indifferently as first or secondary word
Spectral line fwhm
spect.line.width
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Spectral (or velocity) resolution
spect.resolution
Q: means that the word can be used indifferently as first or secondary word
Observed source viewed on the sky
src
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Calibration source
src.calib
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Guide star
src.calib.guideStar
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Source classification (star, galaxy, cluster...)
src.class
Q: means that the word can be used indifferently as first or secondary word
Color classification
src.class.color
Q: means that the word can be used indifferently as first or secondary word
Distance class e.g. Abell
src.class.distance
Q: means that the word can be used indifferently as first or secondary word
Luminosity class
src.class.luminosity
Q: means that the word can be used indifferently as first or secondary word
Richness class e.g. Abell
src.class.richness
Q: means that the word can be used indifferently as first or secondary word
Star/galaxy discriminator, stellarity index
src.class.starGalaxy
Q: means that the word can be used indifferently as first or secondary word
Structure classification e.g. Bautz-Morgan
src.class.struct
Q: means that the word can be used indifferently as first or secondary word
Density of sources
src.density
Q: means that the word can be used indifferently as first or secondary word
Source ellipticity
src.ellipticity
Q: means that the word can be used indifferently as first or secondary word
Impact parameter
src.impactParam
Q: means that the word can be used indifferently as first or secondary word
Morphology structure
src.morph
Q: means that the word can be used indifferently as first or secondary word
Morphological parameter
src.morph.param
Q: means that the word can be used indifferently as first or secondary word
Scale length for a galactic component (disc or bulge)
src.morph.scLength
Q: means that the word can be used indifferently as first or secondary word
Hubble morphological type (galaxies)
src.morph.type
Q: means that the word can be used indifferently as first or secondary word
Qualifier indicating that a quantity (e.g. flux) is background subtracted rather than total
src.net
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Orbital parameters
src.orbital
Q: means that the word can be used indifferently as first or secondary word
Orbit eccentricity
src.orbital.eccentricity
Q: means that the word can be used indifferently as first or secondary word
Orbit inclination
src.orbital.inclination
Q: means that the word can be used indifferently as first or secondary word
Orbit mean anomaly
src.orbital.meanAnomaly
Q: means that the word can be used indifferently as first or secondary word
Mean motion
src.orbital.meanMotion
Q: means that the word can be used indifferently as first or secondary word
Ascending node
src.orbital.node
Q: means that the word can be used indifferently as first or secondary word
Periastron
src.orbital.periastron
Q: means that the word can be used indifferently as first or secondary word
Redshift
src.redshift
Q: means that the word can be used indifferently as first or secondary word
Photometric redshift
src.redshift.phot
Q: means that the word can be used indifferently as first or secondary word
Sample
src.sample
Q: means that the word can be used indifferently as first or secondary word
Spectral type MK
src.spType
Q: means that the word can be used indifferently as first or secondary word
Variability of source
src.var
Q: means that the word can be used indifferently as first or secondary word
Amplitude of variation
src.var.amplitude
E: means a photometric quantity, and can be followed by a word describing a part of the electromagnetic spectrum
Variability index
src.var.index
Q: means that the word can be used indifferently as first or secondary word
Pulse
src.var.pulse
Q: means that the word can be used indifferently as first or secondary word
Statistical parameters
stat
Q: means that the word can be used indifferently as first or secondary word
Correlation between two parameters
stat.correlation
P: means that the word can only be used as primary or first word
Covariance between two parameters
stat.covariance
P: means that the word can only be used as primary or first word
Statistical error
stat.error
P: means that the word can only be used as primary or first word
Systematic error
stat.error.sys
P: means that the word can only be used as primary or first word
Filling factor (volume, time, ..)
stat.filling
Q: means that the word can be used indifferently as first or secondary word
Fit
stat.fit
Q: means that the word can be used indifferently as first or secondary word
Chi-square distribution, test
stat.fit.chi2
P: means that the word can only be used as primary or first word
Degrees of freedom
stat.fit.dof
P: means that the word can only be used as primary or first word
Goodness or significance of fit
stat.fit.goodness
P: means that the word can only be used as primary or first word
Observed minus computed
stat.fit.omc
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Parameter of fit
stat.fit.param
Q: means that the word can be used indifferently as first or secondary word
Residual fit
stat.fit.residual
P: means that the word can only be used as primary or first word
Fourier coefficient
stat.Fourier
Q: means that the word can be used indifferently as first or secondary word
Amplitude Fourier coefficient
stat.Fourier.amplitude
Q: means that the word can be used indifferently as first or secondary word
Likelihood
stat.likelihood
P: means that the word can only be used as primary or first word
Maximum or upper limit
stat.max
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Mean, average value
stat.mean
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Median value
stat.median
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Minimum or lowest limit
stat.min
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Parameter
stat.param
Q: means that the word can be used indifferently as first or secondary word
Probability
stat.probability
Q: means that the word can be used indifferently as first or secondary word
Signal to noise ratio
stat.snr
P: means that the word can only be used as primary or first word
Standard deviation
stat.stdev
P: means that the word can only be used as primary or first word
Qualifier of a generic incalibrated quantity
stat.uncalib
S: stands for only secondary: the word cannot be used as the first word to describe a single quantity
Miscellaneous value
stat.value
Q: means that the word can be used indifferently as first or secondary word
Variance
stat.variance
P: means that the word can only be used as primary or first word
Statistical weight
stat.weight
P: means that the word can only be used as primary or first word
Time, generic quantity in units of time or date
time
Q: means that the word can be used indifferently as first or secondary word
Age
time.age
Q: means that the word can be used indifferently as first or secondary word
Creation time/date (of dataset, file, catalogue,...)
time.creation
Q: means that the word can be used indifferently as first or secondary word
Crossing time
time.crossing
Q: means that the word can be used indifferently as first or secondary word
Interval of time describing the duration of a generic event or phenomenon
time.duration
Q: means that the word can be used indifferently as first or secondary word
End time/date of a generic event
time.end
Q: means that the word can be used indifferently as first or secondary word
Instant of time related to a generic event (epoch, date, Julian date, time stamp/tag,...)
time.epoch
Q: means that the word can be used indifferently as first or secondary word
Equinox
time.equinox
Q: means that the word can be used indifferently as first or secondary word
Time interval, time-bin, time elapsed between two events, not the duration of an event
time.interval
Q: means that the word can be used indifferently as first or secondary word
Lifetime
time.lifetime
Q: means that the word can be used indifferently as first or secondary word
Period, interval of time between the recurrence of phases in a periodic phenomenon
time.period
Q: means that the word can be used indifferently as first or secondary word
Phase, position within a period
time.phase
Q: means that the word can be used indifferently as first or secondary word
A time/date associated with the processing of data
time.processing
Q: means that the word can be used indifferently as first or secondary word
Publication year
time.publiYear
Q: means that the word can be used indifferently as first or secondary word
Relaxation time
time.relax
Q: means that the word can be used indifferently as first or secondary word
The time/date data is available to the public
time.release
Q: means that the word can be used indifferently as first or secondary word
Time resolution
time.resolution
Q: means that the word can be used indifferently as first or secondary word
Timescale
time.scale
Q: means that the word can be used indifferently as first or secondary word
Start time/date of generic event
time.start
Q: means that the word can be used indifferently as first or secondary word