metemptosis

Met`emp`to´sis

n.

1.

(Chron.) 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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metemptosis

the practice of eliminating the bissextile day every 134 years to adjust the date of the new moon. Cf. proemptosis.

See also: Calendar