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