/ fɪˈdeləti; NAmE / noun [ U ]
1.
fidelity (to sth) ( formal ) the quality of being loyal to sb/sth :
fidelity to your principles
2.
fidelity (to sb) the quality of being faithful to your husband, wife or partner by not having a sexual relationship with anyone else :
marital / sexual fidelity
OPP infidelity
3.
fidelity (of sth) (to sth) ( formal ) the quality of being accurate :
the fidelity of the translation to the original text
—see also high fidelity
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WORD ORIGIN
late Middle English : from Old French fidelite or Latin fidelitas , from fidelis faithful, from fides faith. Compare with fealty .