[ fi-del-i-tee, fahy- ]
/ fɪˈdɛl ɪ ti, faɪ- /

noun, plural fi·del·i·ties.

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.

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
2 See loyalty.
5 precision, faithfulness, rigor, meticulousness.
Related formsnon·fi·del·i·ty, nounun·fi·del·i·ty, noun, plural un·fi·del·i·ties. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for fidelity

British Dictionary definitions for fidelity


/ (fɪˈdɛlɪtɪ) /

noun plural -ties

devotion to duties, obligations, etc; faithfulness
loyalty or devotion, as to a person or cause
faithfulness to one's spouse, lover, etc
adherence to truth; accuracy in reporting detail
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