01 n. The moon's age at the beginning of the calendar year, or the number of days by which the last new moon has preceded the beginning of the year.
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1.
The moon's age at the beginning of the calendar year, or the number of days by which the last new moon has preceded the beginning of the year.(Chron.)
Phrases & compounds
Annual epact —
the excess of the solar year over the lunar year, -- being eleven days.
Menstrual epact —
the excess of a calendar month over a lunar.