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From Middle French infidélité, from Latin infidelitas


infidelity (plural infidelities)

  1. 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.
  2. Unfaithfulness in some other moral obligation.
    • 1937, Arnold Oskar Meyer, England in German opinion throughout the centuries, page 6:
      It was disastrous that England's infidelity towards Frederick the Great — which no one, not even a German, condemned more strongly than did William Pitt — had to affect one of the most popular heroes of our national history.
  3. Lack of religious belief.



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