leap second

n. A second of time, as measured by an atomic clock, added to or omitted from official timekeeping systems periodically to compensate for small changes in the rotation of the earth and therefore the length of a solar day.

leap second

n (Units) a second added to or removed from a scale for reckoning time on one particular occasion, to synchronize it with another scale

leap′ sec`ond

n. an extra second intercalated into the world's timekeeping system about once a year, made necessary by the gradual slowing down of the earth's rotation. [1970–75]

Thesaurus

Noun

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 rotations, sec, second - 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites

leap second

See universal time.

leap second

Coordinated Universal Time

AcronymsSeelong shot

leap second

Related to leap second: leap year

noun

Words related to leap second

noun 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

Related Words

s
sec
second

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