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  1. Oxford American Dictionary

    leap second

    • IPA[ˈlēp ˌsekənd]

    美式

    • n.
      a second that is occasionally inserted into the atomic scale of reckoning time in order to bring it into line with solar time. It is indicated by an additional beep in the time signal at the end of some years.

    • noun: leap second, plural noun: leap seconds