Bible Dictionaries
Epact

Webster's Dictionary

(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.

Bibliography Information
Webster, Noah. Entry for 'Epact'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​e/epact.html. 1828.