Meaning

adjective being satisfactory or in satisfactory condition

adverb an expression of agreement normally occurring at the beginning of a sentence

noun money extracted as a penalty

originFrom Middle English fin, fyn, from Old French fin (“fine, minute, exact”), of obscure origin, but probably derived from Latin fīnīre (“to finish”) or fīnis (“boundary, limit, end”), with an abstract sense of fine or thin also arising in many Romance languages (compare Italian, Portuguese, and Spanish fino). Doublet of fino.

Etymology from Wiktionary, CC BY-SA 3.0