| / English Dictionary |
TIME UNIT
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
A unit for measuring time periods
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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