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Leap Second

nounverified·updated May 18, 2026

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

MWEWordset Dictionary

Classifications

Entity Type

Unknown—authoritativeglossary_import_default_pending_classifier
?unassignedlast reviewed —

Sensitivity

unclassified

Information Class

unclassified

Variants

plural
Leap Seconds
possessive
Leap Second's
pluralpossessive
Leap Seconds'