unit of time

Definitions of unit of time

n a unit for measuring time periods

time unit
6 June 1944
date of the Allied landing in France, World War II
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24-hour interval, day, mean solar day, solar day, twenty-four hour period, twenty-four hours
time for Earth to make a complete rotation on its axis
the dark part of the diurnal cycle considered a time unit
mean solar time, mean time
(astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator)
TDT, TT, ephemeris time, terrestrial dynamical time, terrestrial time
(astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions
a time unit of approximately 30 days
day, sidereal day
the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
bell, ship's bell
(nautical) each of the eight half-hour units of nautical time signaled by strokes of a ship's bell; eight bells signals 4:00, 8:00, or 12:00 o'clock, either a.m. or p.m.
60 minutes, hour, hr
a period of time equal to 1/24th of a day
30 minutes, half-hour
a half of an hour
15 minutes, quarter-hour
a quarter of an hour
min, minute
a unit of time equal to 60 seconds or 1/60th of an hour
a unit of time equal to 15 minutes or a quarter of an hour
s, sec, second
1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites
one quintillionth (10^-18) of a second; one thousandth of a femtosecond
one quadrillionth (10^-15) of a second; one thousandth of a picosecond
one trillionth (10^-12) of a second; one thousandth of a nanosecond
one billionth (10^-9) of a second; one thousandth of a microsecond
one millionth (10^-6) of a second; one thousandth of a millisecond
millisecond, msec
one thousandth (10^-3) of a second
the day after today
the day that includes the present moment (as opposed to yesterday or tomorrow)
the day immediately before today
the next day
the day before
date, day of the month
the specified day of the month
a particular day specified as the time something happens
lunar month, lunation, moon, synodic month
the period between successive new moons (29.531 days)
anomalistic month
period between successive perigees; approximately 27.5546 days
sidereal hour
1/24 of a sidereal day
sidereal month
period between successive conjunctions with a star, 27.322 days
solar month
one-twelfth of a solar or tropical year
man hour, person hour
a time unit used in industry for measuring work
leap second
a second (as measured by an atomic clock) added to or subtracted from Greenwich Mean Time in order to compensate for slowing in the Earth's rotation
Type of:
amount, measure, quantity
how much there is or how many there are of something that you can quantify

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