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fidelity

noun [U] (LOYALTY)
 
 
/fɪˈdel.ə.ti/ US  /-t̬i/ formal

Definition

honest or lasting support, or loyalty, especially to a sexual partner: Somerset Maugham's comedy of marital fidelity, 'The Constant Wife' How important do you think sexual fidelity is in a marriage?Loyal, faithful and dependable
(Definition of fidelity noun (LOYALTY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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