leap second
noun Date: 1971 an intercalary second added to Coordinated Universal Time to compensate for the slowing of the earth's rotation and keep Coordinated Universal Time in synchrony with solar time

New Collegiate Dictionary. 2001.

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  • Leap second — A leap second is a one second adjustment that keeps broadcast standards for time of day close to mean solar time. Broadcast standards for civil time are based on Coordinated Universal Time (UTC), a time standard which is maintained using… …   Wikipedia

  • leap second — leap′ sec ond n. hor 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 • Etymology: 1970–75 …   From formal English to slang

  • leap second — noun A second of time added to the year occasionally to compensate for variation in the rate of Earths rotation relative to the absolute standards of time. See Also: leap, leap year, second …   Wiktionary

  • 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 • Hypernyms: ↑second, ↑sec, ↑s …   Useful english dictionary

  • leap second — 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] * * * …   Universalium

  • leap second — noun a second which is occasionally inserted into the atomic scale of reckoning time in order to bring it into line with solar time …   English new terms dictionary

  • leap second —    an extra second added at the end of a day (June 30 or December 31) to realign timekeeping with the earth s rate of rotation. See day for details …   Dictionary of units of measurement

  • LEAP — may refer to: * Jumping * Leap (village) in County Cork, Ireland *The collective noun for a group of leopards * Great Leap Forward the period of the 2nd 5 year plan in ChinaLEAP may mean:* : a software tool for energy and environmental planning.… …   Wikipedia

  • Leap year — A leap year (or intercalary year) is a year containing one or more extra days (or, in the case of lunisolar calendars, an extra month) in order to keep the calendar year synchronised with the astronomical or seasonal year. For example, in the… …   Wikipedia

  • Second — This article is about the unit of time. For other uses, see Second (disambiguation). A light flashing approximately once per second. The second (SI unit symbol: s; informal abbreviation: sec) is a unit of measurement of time, and is the… …   Wikipedia

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