What is the meaning of fidelity?

–noun, plural -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.


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Origin:
1375–1425; late ME fidelite (< MF) < L fidēlitās, equiv. to fidēli- (s. of fidēlis loyal, equiv. to fidē(s) faith + -lis adj. suffix) + -tās -ty 2


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


Antonyms:
2. disloyalty.
n. pl. fi·del·i·ties

Faithfulness to obligations, duties, or observances.

Exact correspondence with fact or with a given quality, condition, or event; accuracy.

The degree to which an electronic system accurately reproduces the sound or image of its input signal.


[Middle English fidelite, from Old French, from Latin fidēlitās, from fidēlis, faithful, from fidēs, faith; see bheidh- in Indo-European roots.]

Synonyms: These nouns denote faithfulness. Fidelity implies the unfailing fulfillment of one's duties and obligations and strict adherence to vows or promises: fidelity to one's spouse.
Allegiance is faithfulness considered as a duty: "I know no South, no North, no East, no West, to which I owe any allegiance.... The Union, Sir, is my country" (Henry Clay).
Fealty, once applied to the obligation of a tenant or vassal to a feudal lord, now suggests faithfulness that one has pledged to uphold: swore fealty to the laws of that country.
Loyalty implies a steadfast and devoted attachment that is not easily turned aside: loyalty to an oath; loyalty to one's family.
: the quality or state of being faithful or loyal; especially : loyalty to one's spouse in refraining from adultery and sometimes in submitting to a spouse's reasonable sexual desires
got this from dictionary.com

As in Republicans= once bought, they stay bought.