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) ?
closed as general reference by FumbleFingers, tchrist, Mahnax, MετάEd, kiamlaluno Sep 3 '12 at 23:52
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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."
An English verb phrase along the same lines is to keep faith. There are not many definitions online; Wiktionary says