epact
English
Etymology
(deprecated template usage) [etyl] French épacte, from (deprecated template usage) [etyl] Ancient Greek ἐπακταί (epaktaí, “intercalary days”), feminine plural of ἐπακτός (epaktós, “brought on or in, added”).
Noun
epact (plural epacts)
- 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