fidelity

noun8

1. •
   Often followed by to or towards: faithfulness or loyalty towards a person, a group, one's civic or moral duties, etc.; allegiance; (countable) an instance of this.

   • the fidelity of the civil servants to their country
2. •
   Faithfulness or loyalty to one's partner or spouse, including restraint from romantic or sexual relationships with third parties.
3. •
   Faithfulness to God and one's religion.
4. •
   Accuracy, or exact correspondence, to some given fact or quality; exactness.

   • Some of the photographs and drawings, […] were first reproduced by Mr. Cooper on wood by means of photography, and then engraved: by this means almost complete fidelity is ensured. — 1872
5. •
   Chiefly in high fidelity, low fidelity, etc.: the degree to which a system accurately reproduces an input such as an image or sound.

   • 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. — 2003
6. •
   The closeness of association between an organism and a plant community.
7. •
   (no longer used) Of a person: honesty, trustworthiness; (countable) an instance of this.

   • [O]ure lord Jesus hymselfe dooth tetifye vnto vs that we receiue hys body and blood. Ought we to doubte of his fidelitie and testimony? — 1534
8. •
   (no longer used) In by one's fidelity, to break fidelity, to give fidelity, etc.: one's pledge or promise to act in good faith; an oath, a word of honour.

   • By my fidelity this is not vvell. — 1597