Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Unfaithfulness to a sexual partner, especially a spouse.
  • noun An act of sexual unfaithfulness.
  • noun Lack of fidelity or loyalty.
  • noun Lack of religious belief.

from The Century Dictionary.

  • noun Lack of faith or belief; unbelief; disbelief: with reference to the essential tenets of any religion.
  • noun Specifically Disbelief in revealed religion; rejection of the doctrine of inspiration of the Scriptures or of the divine origin of Christianity; or, yet more broadly, disbelief in all forms of religious faith.
  • noun Breach of trust; unfaithfulness to a charge or an obligation; dishonesty; disloyalty; deceit: as, the infidelity of a friend or a servant.
  • noun Specifically Unfaithfulness to the marriage-vows; adultery.

from the GNU version of the Collaborative International Dictionary of English.

  • noun 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.
  • noun Unfaithfulness to the marriage vow or contract; violation of the marriage covenant by adultery.
  • noun Breach of trust; unfaithfulness to a charge, or to moral obligation; treachery; deceit.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Unfaithfulness in marriage: practice or instance of having a sexual or romantic affair with someone other than one's spouse, without the consent of the spouse.
  • noun Unfaithfulness in some other moral obligation.
  • noun Lack of religious belief.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the quality of being unfaithful

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

in- +‎ fidelity

Examples

  • And again: "Hadst thou not had a villain's heart, thou shouldst have gained my consent, then made this match, instead of hiding it from those who loved thee" -- a sentiment which would seem to us astounding and inexplicable had we not became familiar with it in the preceding pages relating to savages and barbarians, by whom what we call infidelity was considered unobjectionable, provided it was not done secretly.

    Primitive Love and Love-Stories

  • What does it mean, this gradual growth of what we call infidelity, of criticism and science on the one hand, this gradual death of the old traditions on the other?

    Robert Elsmere

  • What does it mean: this gradual growth of what we call infidelity, of criticism and science on the one hand, this gradual death of the old traditions on the other?

    Robert Elsmere

  • For such men, who are in fact profoundly monogamous, infidelity is almost unavoidable.

    ProWomanProLife » I beg to differ

  • My only objection to infidelity is the deception required.

    ProWomanProLife » I beg to differ

  • It's ironic because Sarah's infidelity is the reason the couple find themselves on the beach in the first place.

    A Conversation with Chris Cleave about Little Bee

  • A 2008 study by the National Science Foundation found that 15 percent of women over 60 admit to having had an affair in their lifetimes, and that the rate of female infidelity is actually growing faster than that of males.

    Sunday Reading

  • When we were making it, the arguments on set were just amazing about whether mental infidelity is better or worse than physical infidelity.

    Keira Knightley Reacts To Being Called A S*** Actress

  • Not all divorces mean people cheat but infidelity is the number one reason for divorce.

    Tiger Woods, Tiger Woods, Oh My God, Tiger Woods! « Colleen Anderson

  • For such men, who are in fact profoundly monogamous, infidelity is almost unavoidable.

    ProWomanProLife » 2009 » December

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