Library / English Dictionary

    TIME UNIT

    Pronunciation (US): Play  (GB): Play

     I. (noun) 

    Sense 1

    Meaning:

    A unit for measuring time periodsplay

    Synonyms:

    time unit; unit of time

    Classified under:

    Nouns denoting time and temporal relations

    Hypernyms ("time unit" is a kind of...):

    amount; measure; quantity (how much there is or how many there are of something that you can quantify)

    Hyponyms (each of the following is a kind of "time unit"):

    millisecond; msec (one thousandth (10^-3) of a second)

    microsecond (one millionth (10^-6) of a second; one thousandth of a millisecond)

    nanosecond (one billionth (10^-9) of a second; one thousandth of a microsecond)

    picosecond (one trillionth (10^-12) of a second; one thousandth of a nanosecond)

    femtosecond (one quadrillionth (10^-15) of a second; one thousandth of a picosecond)

    attosecond (one quintillionth (10^-18) of a second; one thousandth of a femtosecond)

    s; sec; second (1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites)

    quarter (a unit of time equal to 15 minutes or a quarter of an hour)

    min; minute (a unit of time equal to 60 seconds or 1/60th of an hour)

    15 minutes; quarter-hour (a quarter of an hour)

    30 minutes; half-hour (a half of an hour)

    60 minutes; hour; hr (a period of time equal to 1/24th of a 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.)

    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)

    month (a time unit of approximately 30 days)

    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)

    mean solar time; mean time ((astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator))

    night (the dark part of the diurnal cycle considered a time unit)

    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)

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