Definition of epact in English:

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epact

Pronunciation: /ˈiːpakt/

noun

The number of days by which the solar year exceeds the lunar year.

Origin

Mid 16th century (denoting the age of the moon in days at the beginning of the calendar year): from French épacte, via late Latin from Greek epaktai (hēmerai) 'intercalated (days)', from epagein 'bring in', from epi 'in addition' + agein 'bring'.

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