fi·del·i·ty

[fi-del-i-tee, fahy-]
noun, plural fi·del·i·ties.
1.
strict observance of promises, duties, etc.: a servant's fidelity.
2.
loyalty: fidelity to one's country.
3.
conjugal faithfulness.
4.
adherence to fact or detail.
5.
accuracy; exactness: The speech was transcribed with great fidelity.
6.
Audio, Video. the degree of accuracy with which sound or images are recorded or reproduced.

Origin:
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

non·fi·del·i·ty, noun
un·fi·del·i·ty, noun, plural un·fi·del·i·ties.


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


2. disloyalty.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Fidelity is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
fidelity (fɪˈdɛlɪtɪ) [Click for IPA pronunciation guide]
 
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
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Etymonline
Word Origin & History

fidelity
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
So it's a more high-fidelity environment, with less flexibility for the user.
The breathtaking realism of the landscape owed its fidelity to photography.
Fidelity generally supports the inclusion of a mandatory stress test in the
  rule.
Fidelity to cherished beliefs has been replaced by loyalty to anything that
  brings material benefit.
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