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Learner's definition of FIDELITY  
: the quality of being faithful to your husband, wife, or sexual partner — often + to
— opposite infidelity
   b  : the quality of being faithful or loyal to a country, organization, etc. — usually + to
: the degree to which something matches or copies something else — + to
: the degree to which a device (such as a CD player, radio, or television) correctly reproduces sounds, pictures, etc.
— see also high fidelity
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