[fi-del-i-tee, fahy-]
noun, plural fidelities.
strict observance of promises, duties, etc.: a servant's fidelity.
loyalty: fidelity to one's country.
conjugal faithfulness.
adherence to fact or detail.
accuracy; exactness: The speech was transcribed with great fidelity.
Audio, Video. the degree of accuracy with which sound or images are recorded or reproduced.

1375–1425; late Middle English fidelite (< Middle French) < Latin fidēlitās, equivalent to fidēli- (stem of fidēlis loyal, equivalent to fidē(s) faith + -lis adj. suffix) + -tās -ty2

nonfidelity, noun
unfidelity, noun, plural unfidelities.

2. See loyalty. 5. precision, faithfulness, rigor, meticulousness.

2. disloyalty. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fidelity (fɪˈdɛlɪtɪ)
n , pl -ties
1.  devotion to duties, obligations, etc; faithfulness
2.  loyalty or devotion, as to a person or cause
3.  faithfulness to one's spouse, lover, etc
4.  adherence to truth; accuracy in reporting detail
5.  electronics See also high fidelity the degree to which the output of a system, such as an amplifier or radio, accurately reproduces the characteristics of the input signal
[C15: from Latin fidēlitās, from fidēlis faithful, from fidēs faith, loyalty]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1494, from M.Fr. fidélité, from L. fidelitatem (nom. fidelitas) "faithfulness, adherence," from fidelis "faithful," from fides "faith" (see faith).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The trouble is that a crucial step-doing a brain scan to set up the computer
  model-cannot be done with fidelity.
Her biggest challenge will be restraint though, and fidelity to that limited
  purpose she describes.
The breathtaking realism of the landscape owed its fidelity to photography.
He always lovingly trusted in you with a fidelity that your manifold
  treacheries were not able to shake.
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