Hour

• hour

  A period of time equal to 1/24th of a day; "the job will take more than an hour".

• minute

  A unit of time equal to 60 seconds or 1/60th of an hour; "he ran a 4 minute mile".

• half-hour

  A half of an hour.

• 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...

Femtosecond

• 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.

Nanosecond

• 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.

Millisecond

• microsecond

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

• millisecond

  One thousandth (10^-3) of a second.

Astronomy

• mean time

  (astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly...

• TT

  (astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar...

Also contains

• day

  Time for Earth to make a complete rotation on its axis; "two days later they left"; "they put...

• month

  A time unit of approximately 30 days; "he was given a month to pay the bill".

• second

  1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unite...

• bell

  (nautical) each of the eight half-hour units of nautical time signaled by strokes of a ship's...

• night

  The dark part of the diurnal cycle considered a time unit; "three nights later he collaps...

• day

  The time for one complete rotation of the earth relative to a particular star, about 4 minutes...