n., pl., -ies.
Voluntary sexual intercourse between a married person and a partner other than the lawful spouse.
[Middle English, from Old French adultere, from Latin adulterium, from adulter, adulterer. See adulterate.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
