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EPACT

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e⋅pact

[ee-pakt]
–noun
1. the difference in days between a solar year and a lunar year.
2. the number of days since the new moon at the beginning of the calendar year, January 1.

Origin:
1545–55; < LL epacta < Gk epakt, n. use of fem. of epaktós added, equiv. to ep- ep- + ag(ein) to lead + -tos verbid suffix
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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e·pact   (ē'pākt')   
n.  The period of time necessary to bring the solar calendar into harmony with the lunar calendar.

[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; see ag- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

epact 
1552, "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 Fr. epacte, from L. epacta, from Gk. epaktos, verbal adj. of epagein "to intercalate, add, bring forward," from epi "on" + agein "to bring, to lead" (cognate with L. agere "to drive, set in motion;" see act).
Online Etymology Dictionary, © 2001 Douglas Harper
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Abbreviations & Acronyms
EPAct
[National] Energy Policy Act
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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