Epact meaning

ēpăkt
The period of time necessary to bring the solar calendar into harmony with the lunar calendar.
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The age, in days, of the calendar moon on the first of the year.
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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.
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The period of about eleven days by which the solar year exceeds the lunar year of twelve months.
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Origin of epact

  • French épacte from Late Latin epacta from Greek epaktē (hēmera) intercalary (day) feminine of epaktos brought in, inserted from epagein to bring in, introduce ep-, epi- epi- agein to lead ag- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition