time unit

Noun
  1. A unit for measuring time periods (synset 115179734)
    is a type of: amount, measure, quantity - how much there is or how many there are of something that you can quantify
    subtypes:
    • 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
    • night - 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)
    • 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
    • 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
    • quarter - 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
    • 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
    same as: unit of time

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