Category: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.