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Can anyone tell me the etymological root of the word "fidelity" ? I've found here the adjective form of it to be "fidelitous" (faithful). I don't know whether it's correct. And what is the verb of it (i.e to trust) ?

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closed as general reference by FumbleFingers, tchrist, Mahnax, MετάEd, kiamlaluno Sep 3 '12 at 23:52

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

OED gives fide v. rare. [f. L. fīd-ĕre to confide.] trans. To confide or entrust to. With 1863 citation "The‥request that her infant daughter might be fided to the care of her friend." But I think the etymology is General Reference, and that verb form is Too Localised. – FumbleFingers Aug 29 '12 at 22:25
Fide (v.) and Fidelitous (Adj.) says my teacher too. – its_me Aug 30 '12 at 6:46

Based on (Merriam-Webster Online's definition), it comes from Latin (by way of French and Middle English): fides meaning faith and fidere meaning to trust.

Fidelitous is the adjective, although it's not used all that commonly. There's not a verb form that I've seen or can find, and the verb form wouldn't mean "to trust," but "to be faithful."

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An English verb phrase along the same lines is to keep faith. There are not many definitions online; Wiktionary says

(transitive)to continue to have confidence in someone or something, and to support them or it

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