Etymology
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fidelity (n.)

early 15c., "faithfulness, devotion," from Old French fidélité (15c.), from Latin fidelitatem (nominative fidelitas) "faithfulness, adherence, trustiness," from fidelis "faithful, true, trusty, sincere," from fides "faith" (from PIE root *bheidh- "to trust, confide, persuade"). From 1530s as "faithful adherence to truth or reality;" specifically of sound reproduction from 1878.

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Definitions of fidelity

fidelity (n.)
accuracy with which an electronic system reproduces the sound or image of its input signal;
fidelity (n.)
the quality of being faithful;
Synonyms: faithfulness
From wordnet.princeton.edu