What does "epact" mean?

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

What is a synonym for "epact"?

Common synonyms include: balance, credit, deficit, difference, discrepancy, net.

Epact

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
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

Synonyms

All synonyms

balance credit deficit difference discrepancy net

Etymology

From French épacte, from Latin epactae, from Ancient Greek ἐπακταί (epaktaí, “intercalary days”), feminine plural of ἐπακτός (epaktós, “brought on or in, added”).

Related phrases

lunar month solar year

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.