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infidelity

[in-fi-del-i-tee] /ˌɪn fɪˈdɛl ɪ ti/
noun, plural infidelities.
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.
Origin
late Middle English
1375-1425
1375-1425; late Middle English < Latin infidēlitās, equivalent to infidēli(s) unfaithful (see infidel) + -tās -ty2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for in fidelity

infidelity

/ˌɪnfɪˈdɛlɪtɪ/
noun (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 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 in fidelity
infidelity
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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