# unit of time

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Noun | 1. | unit of time - a unit for measuring time periods quantity, measure, amount - how much there is or how many there are of something that you can quantify 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; "two days later they left"; "they put on two performances every day"; "there are 30,000 passengers per day" night - the dark part of the diurnal cycle considered a time unit; "three nights later he collapsed" mean solar time, mean time - (astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator) ephemeris time, TDT, terrestrial dynamical time, terrestrial time, TT - (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 month - a time unit of approximately 30 days; "he was given a month to pay the bill" sidereal day, day - the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day ship's bell, 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; "the job will take more than an hour" 30 minutes, half-hour - a half of an hour 15 minutes, quarter-hour - a quarter of an hour quarter - a unit of time equal to 15 minutes or a quarter of an hour; "it's a quarter til 4"; "a quarter after 4 o'clock" s, sec, second - 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites attosecond - one quintillionth (10^-18) of a second; one thousandth of a femtosecond femtosecond - one quadrillionth (10^-15) of a second; one thousandth of a picosecond picosecond - one trillionth (10^-12) of a second; one thousandth of a nanosecond nanosecond - one billionth (10^-9) of a second; one thousandth of a microsecond microsecond - one millionth (10^-6) of a second; one thousandth of a millisecond millisecond, msec - one thousandth (10^-3) of a second |

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