noun, plural infidelities.
marital disloyalty; adultery.
unfaithfulness; disloyalty.
lack of religious faith, especially Christian faith.
a breach of trust or a disloyal act; transgression.

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. 2014.
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World English Dictionary
infidelity (ˌɪnfɪˈdɛlɪtɪ)
n , pl -ties
1.  lack of faith or constancy, esp sexual faithfulness
2.  lack of religious faith; disbelief
3.  an act or instance of disloyalty

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

1509, "want of faith, unbelief in religion," from L. infidelitas "unfaithfulness," noun of quality from infidelis (see infidel). Meaning "unfaithfulness or disloyalty to a person" is from 1529, originally to a sovereign, later 16c. to a lover or spouse.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
One ends up feeling worse for the agonized cheaters in these stories than the
  victims of their infidelity.
Tales of infidelity and its consequences figured largely in her
  conversation-though she judged on a sliding scale.
Brill outlines a magical courtship and an idyllic wedded life, destroyed by his
  own romantic restlessness and infidelity.
Truth isn't synonymous with historicity, and infidelity to the latter isn't
  necessarily betrayal of the former.
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