Meaning of epact

e•pact

Pronunciation: (ē'pakt), [key]
— n.
  1. the difference in days between a solar year and a lunar year.
  2. the number of days since the new moon at the beginning of the calendar year, January 1.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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