unit of time

Definitions of unit of time
  1. noun
    a unit for measuring time periods
    synonyms: time unit
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    examples:
    6 June 1944
    date of the Allied landing in France, World War II
    types:
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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
    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)
    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
    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
    tomorrow
    the day after today
    today
    the day that includes the present moment (as opposed to yesterday or tomorrow)
    yesterday
    the day immediately before today
    morrow
    the next day
    eve
    the day before
    date, day of the month
    the specified day of the month
    date
    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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