Met`emp*to"sis (?), n. [NL., from Gr.
? beyond, after + ? a falling upon, fr. ? to fall in or upon;
? in + ? 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.