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From our dictionary:
Pronunciation: (fi-del'i-tE, fI-), [key]
1. strict observance of promises, duties, etc.: a servant's fidelity.
2. loyalty: fidelity to one's country.
3. conjugal faithfulness.
4. adherence to fact or detail.
5. accuracy; exactness: The speech was transcribed with great fidelity.
6. Audio., Video.the degree of accuracy with which sound or images are recorded or reproduced.