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Dictionary Language resources

infidelity

Pronunciation: /ɪnfɪˈdɛlɪti/

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Definition of infidelity

noun (plural infidelities)

[mass noun]

1the action or state of being unfaithful to a spouse or other sexual partner:her infidelity continued after her marriage [count noun]:I ought not to have tolerated his infidelities

2disbelief in a particular religion, especially Christianity.

Origin:

late Middle English (in the senses 'lack of faith' and 'disloyalty'): from Old French infidelite or Latin infidelitas, from infidelis 'not faithful' (see infidel)