adultery

[ uh-duhl-tuh-ree ]
/ əˈdʌl tə ri /

noun, plural a·dul·ter·ies.

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

Origin of adultery

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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for adultery

adultery

/ (əˈdʌltərɪ) /

noun plural -teries

voluntary sexual intercourse between a married man or woman and a partner other than the legal spouse

Word Origin for adultery

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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012