Definition of "fidelity" in English

noun

1. Faithfulness to one's moral or civic duties.

   • the fidelity of the civil servants

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. (archaic) Faithfulness to God and one's religion.

   • Near-synonym: faith