As nouns the difference between terms and epact
is that terms is while epact is the time (number of days) by which a solar year exceeds twelve lunar months; it is used in the calculation of the date of easter.
terms
English
Noun
(head)
Statistics
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epact
Noun
(
en noun)
the time (number of days) by which a solar year exceeds twelve lunar months; it is used in the calculation of the date of Easter