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The definition of infidelity

3 Definitions of: infidelity

1. noun, lack of faith or constancy, esp sexual faithfulness
2. noun, lack of religious faith; disbelief
3. noun, an act or instance of disloyalty
4. Show me some examples of this word: infidelity
5. Show me the etymology of the word: infidelity

Synonyms:	unfaithful, cheat (informal), adultery, duplicity, disloyalty, perfidy, false, faithless

From Collins