noun
1.
constancy to something to which one is bound by a pledge or duty
we must practice fidelity to our word
Synonyms: allegiance, ardor, devotion, faithfulness, fealty, loyalty, piety
Related Word: constancy, staunchness, steadfastness; dependability, reliability, trustworthiness
Contrasted words: disloyalty, falseness, falsity, perfidiousness, traitorousness, treacherousness, treachery; undependableness, unreliability, untrustworthiness
Antonyms: perfidy; faithlessness
2.
Synonyms: attachment 1, adherence, adhesion, constancy, faithfulness, loyalty
Antonyms: infidelity