D defs.my
Entry 1 sense Webster, 1913

Metemptosis

· Met·emp·to·sis · IPA
01 n. 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…
  1. 1.
    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.(Chron.)