Metemptosis
Metemptosis , noun
[New Latin, from Greek {not transcribed} beyond, after + {not transcribed} a falling upon, from {not transcribed} to fall in or upon; {not transcribed} in + {not transcribed} to fall.]
(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.