Definition of "fidelity"

fidelity

/fɪˈdɛl.ɪ.ti/

noun
countable and uncountable, plural fidelities
1. Faithfulness to one's 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.
  Quotations
  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, Proceedings of the Twenty-ninth International Conference on Very Large Databases, Berlin, Germany, 9-12 September, 2003, page 58