Try Our Apps


Avoid these words. Seriously.


[ee-pakt] /ˈi pækt/
the difference in days between a solar year and a lunar year.
the number of days since the new moon at the beginning of the calendar year, January 1.
Origin of epact
1545-55; < Late Latin epacta < Greek epaktḗ, noun use of feminine of epaktós added, equivalent to ep- ep- + ag(ein) to lead + -tos verbid suffix Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
Examples from the Web for epact
Historical Examples
British Dictionary definitions for epact


the difference in time, about 11 days, between the solar year and the lunar year
the number of days between the beginning of the calendar year and the new moon immediately preceding this
the difference in time between the calendar month and the synodic month
Word Origin
C16: via Late Latin from Greek epaktē, from epagein to bring in, intercalate, from agein to lead
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for epact

1550s, "number of days by which the solar year exceeds a lunar one of 12 moons;" also "number of days into the moon on which the solar year begins;" from French épacte (12c.), from Late Latin epacta "an intercalary day," from Greek epaktos, literally "brought in, inported," verbal adjective of epagein "to intercalate, add, bring forward," from epi "on" (see epi-) + agein "to bring, to lead" (see act (v.)).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source

Word of the Day

Nearby words for epact

Word Value for epact

Scrabble Words With Friends