Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of proemptosis is as below...

Proemptosis :: Proemptosis (n.) The addition of a day to the lunar calendar.

Metemptosis :: Metemptosis (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 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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