epact noun. ['i:pakt] M16.
[Old & mod. French épacte from late Latin epactae pl., from Greek epactai intercalated (sc. hēmerai days) fem. pl. of epaktos brought in from epagein bring in, formed as EPI- + agein lead.]
1. The age of the moon in days at the beginning of a calendar year. M16.

2. The period of about 11 days by which the solar year is longer than the lunar year; any of these days. L16.

3. An intercalated day or period. rare. E17.

[TahlilGaran] English Dictionary ▲