Definition of fidelity noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//fɪˈdeləti//
    ; NAmE NAmE//fɪˈdeləti//
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  1. 1fidelity (to something) (formal) the quality of being loyal to somebody/something fidelity to your principles
  2. 2fidelity (to somebody) the quality of being faithful to your husband, wife or partner by not having a sexual relationship with anyone else marital/sexual fidelity opposite infidelity
  3. 3fidelity (of something) (to something) (formal) the quality of being accurate the fidelity of the translation to the original text see also high fidelity
  4. Word Originlate Middle English: from Old French fidelite or Latin fidelitas, from fidelis ‘faithful’, from fides ‘faith’. Compare with fealty.Extra examples The story is told with great fidelity to the original. They still maintain fidelity to their religious tradition. They swore an oath of fidelity to their king.
See the Oxford Advanced American Dictionary entry: fidelity

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