Middle French epacte, from Late Latin epacta, from Greek epaktē, from epagein to bring in, intercalate, from epi- + agein to drive — more at agent
1588, in the meaning defined above
“Epact.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/epact. Accessed 28 Nov. 2022.
Britannica.com: Encyclopedia article about epact
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