[fi-del-i-tee, fahy-]
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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 of fidelity

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
Related formsnon·fi·del·i·ty, nounun·fi·del·i·ty, noun, plural un·fi·del·i·ties.

Synonyms for fidelity

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

Antonyms for fidelity Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for fidelity


noun plural -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 the degree to which the output of a system, such as an amplifier or radio, accurately reproduces the characteristics of the input signalSee also high fidelity

Word Origin for fidelity

C15: from Latin fidēlitās, from fidēlis faithful, from fidēs faith, loyalty
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for fidelity

early 15c., from Middle French fidélité (15c.), from Latin fidelitatem (nominative fidelitas) "faithfulness, adherence," from fidelis "faithful, true," from fides "faith" (see faith).

Online Etymology Dictionary, © 2010 Douglas Harper