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infidelity

[in-fi-del-i-tee]
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noun, plural in·fi·del·i·ties.
  1. marital disloyalty; adultery.
  2. unfaithfulness; disloyalty.
  3. lack of religious faith, especially Christian faith.
  4. a breach of trust or a disloyal act; transgression.
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Origin of infidelity

1375–1425; late Middle English < Latin infidēlitās, equivalent to infidēli(s) unfaithful (see infidel) + -tās -ty2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for infidelity

infidelity

noun plural -ties
  1. lack of faith or constancy, esp sexual faithfulness
  2. lack of religious faith; disbelief
  3. an act or instance of disloyalty
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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

Word Origin and History for infidelity

n.

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).

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Online Etymology Dictionary, © 2010 Douglas Harper