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The Collaborative International Dictionary of English v.0.48 (gcide)

Infidelity \In`fi*del"i*ty\, n.; pl. {Infidelities}. [L.
infidelitas: cf. F. infid['e]lit['e].]
[1913 Webster]
1. Lack of faith or belief in some religious system;
especially, a lack of faith in, or disbelief of, the
inspiration of the Scriptures, of the divine origin of
Christianity.
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There is, indeed, no doubt but that vanity is one of
the principal causes of infidelity. --V. Knox.
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2. Unfaithfulness to the marriage vow or contract; violation
of the marriage covenant by adultery.
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3. Breach of trust; unfaithfulness to a charge, or to moral
obligation; treachery; deceit; as, the infidelity of a
servant. "The infidelity of friends." --Sir W. Temple.
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