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The Collaborative International Dictionary of English v.0.48 (gcide)

Epact \E"pact\ ([=e]"p[a^]kt), n. [F. ['e]pacte, fr. Gr.
'epakto`s brought on or in, added, fr. 'epa`gein to bring on
or in; 'epi` on, in 'a`gein to bring or lead. See {Epi-},
and {Act}.] (Chron.)
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.
[1913 Webster]

{Annual epact}, the excess of the solar year over the lunar
year, -- being eleven days.

{Menstrual epact}, or {Monthly epact}, the excess of a
calendar month over a lunar.
[1913 Webster]

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