- 1fidelity (to something) (formal) the quality of being loyal to someone or something fidelity to your principles
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- 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
- 3fidelity (of something) (to something) (formal) the quality of being accurate the fidelity of the translation to the original text see high fidelity
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