in-fidelity

infidelity

[in-fi-del-i-tee]
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:
1375–1425; late Middle English < Latin infidēlitās, equivalent to infidēli(s) unfaithful (see infidel) + -tās -ty2

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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

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Word Origin & History

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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