noun, plural adulteries.
voluntary sexual intercourse between a married person and someone other than his or her lawful spouse.

1325–75; Middle English adulterie < Latin adulterium, equivalent to adulter (see adulterer) + -ium -ium; replacing Middle English a(d)vouterie < Old French avoutrie < Latin, with ad- ad- replacing a a-5 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adultery (əˈdʌltərɪ)
n , pl -teries
voluntary sexual intercourse between a married man or woman and a partner other than the legal spouse
[C15: adulterie, altered (as if directly from Latin adulterium) from C14 avoutrie, via Old French from Latin adulterium, from adulter, back formation from adulterāre. See adulterate]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"voluntary violation of the marriage bed," c.1300, avoutrie, from O.Fr. avoutrie, aoulterie, noun of condition from avoutre/aoutre, from L. adulterare "to corrupt" (see adulteration). Modern spelling, with the re-inserted -d-, is from early 15c. (see
ad-). Classified as single adultery (with an unmarried person) and double adultery (with a married person). O.E. word was æwbryce "breach of law(ful marriage)." Adultery Dune in Arizona corresponds to Navajo sei adilehe "adultery sand" and was where illicit lovers met privately.
Online Etymology Dictionary, © 2010 Douglas Harper
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Bible Dictionary

Adultery definition

conjugal infidelity. An adulterer was a man who had illicit intercourse with a married or a betrothed woman, and such a woman was an adulteress. Intercourse between a married man and an unmarried woman was fornication. Adultery was regarded as a great social wrong, as well as a great sin. The Mosaic law (Num. 5:11-31) prescribed that the suspected wife should be tried by the ordeal of the "water of jealousy." There is, however, no recorded instance of the application of this law. In subsequent times the Rabbis made various regulations with the view of discovering the guilty party, and of bringing about a divorce. It has been inferred from John 8:1-11 that this sin became very common during the age preceding the destruction of Jerusalem. Idolatry, covetousness, and apostasy are spoken of as adultery spiritually (Jer. 3:6, 8, 9; Ezek. 16:32; Hos. 1:2:3; Rev. 2:22). An apostate church is an adulteress (Isa. 1:21; Ezek. 23:4, 7, 37), and the Jews are styled "an adulterous generation" (Matt. 12:39). (Comp. Rev. 12.)

Easton's 1897 Bible Dictionary
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Example sentences
In the case of adultery, the judges might be influenced by their experience in
  divorce courts.
Norrie explores the subject of marital tension and adultery through two couples.
This, he said, constituted adultery and grounds for divorce.
The missionaries also forbade working and amusement on Sundays, swearing and
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