Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun leap_second

1 sense of leap second

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