fidelity

n. strict faithfulness, loyalty; exactness, precision, accuracy; adherence to detail

Fidelity is a notion that at its most abstract level implies a truthful connection to a source or sources. Its original meaning dealt with loyalty and attentiveness to one's duty to a lord or a king, in a broader sense than the related concept of fealty. Both derive from the Latin word fidelitas, meaning "faithfulness."
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The degree to which a system, or a portion of a system, accurately reproduces, at its output, the essential characteristics of the signal impressed upon its input or the result of a prescribed operation on the signal impressed upon its input. (188 )

Noun
1. accuracy with which an electronic system reproduces the sound or image of its input signal
(hypernym) accuracy, truth
2. the quality of being faithful
(synonym) faithfulness
(antonym) infidelity, unfaithfulness
(hypernym) quality
(hyponym) constancy
(attribute) faithful