# fidelity

> English word · Noun · IPA /fɪˈdɛl.ɪ.ti/ · frequency rank #14,536

## Definitions
1. Faithfulness to one's moral or civic duties.
2. Loyalty to one's spouse or partner, including abstention from cheating or extramarital affairs.
3. Accuracy, or exact correspondence to some given quality or fact.
4. The degree to which a system accurately reproduces an input.
5. Faithfulness to God and one's religion.

## Etymology
15th century, from Middle English [Term?], from Middle French fidélité, from Latin fidēlitās, from fidēlis (“faithful”), from fidēs (“faith, loyalty”) (English faith), from Proto-Indo-European *bʰidʰ-, zero-grade of *bʰeydʰ- (“to command, to persuade, to trust”) (English bide). Doublet of fealty.

## Easily confused with
- **finality** (https://plainspell.com/en/vs/fidelity-vs-finality)

## Common misspellings (12)
`fdielity`, `ffidelity`, `fiddelity`, `fideilty`, `fidelitty`, `fidelityy`, `fideliyt`, `fidellity`, `fideltiy`, `fidleity`, `fiedlity`, `ifdelity`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/fidelity