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epact definition

epact (ē′pakt′)

noun

  1. the period of about eleven days by which the solar year exceeds the lunar year of twelve months
  2. the age, in days, of the calendar moon on the first of the year

Etymology: Fr épacte < LL epactae < Gr epaktai (hemerai), intercalary (days) < epagein, to bring in, intercalate < epi-, on, in + agein, to bring, lead: see act

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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