What is the meaning of Fides?

faith; belief (belief without empirical evidence, direct experience, or observation)

reliance (act of relying on or trusting)

confidence; trust (confidence in or reliance on some person or quality)

credit (acceptance of the truth of something said or done)

loyalty; fidelity, faith (state of demonstrating undivided and constant support for someone or something)

good faith (good, honest intentions)

honesty (act, quality, or condition of being honest)

guarantee; promise (an assurance of something to be done)

help; assistance

second-person singular future active indicative of fīdō (“to trust; to put confidence in”)

string; cord; gutstring

a lyre, lute, harp, or another stringed instrument

nominative/accusative/vocative plural of fidis

dative plural of fid

Source: wiktionary.org