infidelity


noun, plural in·fi·del·i·ties.

  1. marital disloyalty; adultery.
  2. unfaithfulness; disloyalty.
  3. lack of religious faith, especially Christian faith.
  4. a breach of trust or a disloyal act; transgression.

noun plural -ties

  1. lack of faith or constancy, esp sexual faithfulness
  2. lack of religious faith; disbelief
  3. an act or instance of disloyalty
n.

c.1400, “want of faith, unbelief in religion; false belief, paganism;” also (early 15c.) “unfaithfulness or disloyalty to a person” (originally to a sovereign, by 16c. to a lover or spouse), from French infidélité, from Latin infidelitatem (nominative infidelitas) “unfaithfulness, faithlessness,” noun of quality from infidelis (see infidel).

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