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[in-fi-del-i-tee] /ˌɪn fɪˈdɛl ɪ ti/
noun, plural infidelities.
marital disloyalty; adultery.
unfaithfulness; disloyalty.
lack of religious faith, especially Christian faith.
a breach of trust or a disloyal act; transgression.
Origin of infidelity
late Middle English
1375-1425; late Middle English < Latin infidēlitās, equivalent to infidēli(s) unfaithful (see infidel) + -tās -ty2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for infidelity
Contemporary Examples
Historical Examples
  • Other insects, such as the spider, are considered by their presence to incite married persons to infidelity.

  • It led to infidelity, to immorality, and to a return to many pagan practices.

    History of Education Levi Seeley
  • The religion of Odd-fellowship is infidelity, and its prayers are infidel prayers.

    Secret Societies David MacDill, Jonathan Blanchard, and Edward Beecher
  • I would have killed him but that would have been almost an infidelity.

    Fantazius Mallare Ben Hecht
  • This almost broke my heart; it was an infidelity committed on the other side of the grave.

    A Book of Scoundrels Charles Whibley
British Dictionary definitions for infidelity


noun (pl) -ties
lack of faith or constancy, esp sexual faithfulness
lack of religious faith; disbelief
an act or instance of disloyalty
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
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Word Origin and History for infidelity

c.1400, "want of faith, unbelief in religion; false belief, paganism;" also (early 15c.) "unfaithfulness or disloyalty to a person" (originally to a sovereign, by 16c. to a lover or spouse), from French infidélité, from Latin infidelitatem (nominative infidelitas) "unfaithfulness, faithlessness," noun of quality from infidelis (see infidel).

Online Etymology Dictionary, © 2010 Douglas Harper
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