fidelity
Concise Oxford English Dictionary © 2008 Oxford University Press:
fidelity /fɪˈdɛlɪti/
▶noun
- 1 continuing loyalty to a person, cause, or belief.
- 2 the degree of exactness with which something is copied or reproduced.
– origin ME: from OFr. fidelite or L. fidelitas, from fidelis ‘faithful’, from fides ‘faith’; cf. fealty.
'fidelity' also found in these Oxford entries:

