1 (formal 正式)fidelity (to sb/sth) the quality of being faithful, especially to a wife or husband by not having a sexual relationship with anyone else 忠诚；忠实；忠贞 ☞A less formal word is faithfulness. 不大正式的场合用faithfulness。 [OPP] infidelity 反义词为infidelity

2 (used about translations, the reproduction of music, etc) the quality of being accurate or close to the original （指翻译、音乐复制等）精确性，准确性，保真度 ☞ Look at hi-fi. 参看hi-fi。