15th century, from , 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). Pronunciation
  • IPA: /fɪˈdɛl.ɪ.ti/, /faɪˈdɛl.ɪ.ti/


  1. Faithfulness to one's duties.
    the fidelity of the civil servants
  2. Loyalty to one's spouse or partner, including abstention from extramarital affairs.
  3. Accuracy, or exact correspondence to some given quality or fact.
  4. The degree to which a system accurately reproduces an input.
    • 2003, Proceedings of the Twenty-ninth International Conference on Very Large Databases, Berlin, Germany, 9-12 September, 2003, page 58:
      By placing them closer to the source, we can reduce the number of messages in the system and this in turn is likely to improve the fidelity of the system.
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