metemptosis

Met`emp*to"sis, n. Etym: [NL., from Gr. (Chron.) Defn: The suppression of a day in the calendar to prevent the date of the new moon being set a day too late, or the suppression of the bissextile day once in 134 years. The opposite to this is the proemptosis, or the addition of a day every 330 years, and another every 2,400 years.

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