fidelity
/fɪˈdelətɪ/noun
mass noun
1- faithfulness to a person, cause, or belief, demonstrated by continuing loyalty and support忠诚, 忠实：
he sought only the strictest fidelity to justice.
他寻求的只是对正义的绝对忠诚。
1.1
- sexual faithfulness to a spouse or partner（对配偶或伴侣的）忠贞。
1.2
- the degree of exactness with which something is copied or reproduced确切, 精确; 保真度, 逼真度：
the 1949 recording provides reasonable fidelity.
1949年的录音保真度还不错。
词源
late Middle English: from Old French fidelite or Latin fidelitas, from fidelis 'faithful', from fides 'faith'. Compare with FEALTY.