for (on behalf of) · for (in order to obtain) · for (over a period of time)
eş: per
köken: From Old Galician-Portuguese por, from Late Latin pōr, from Latin prō (“for”) (with metathetic shift under the influence of per). Usurped the roles of Latin per.
köken: From suffixed noun ért, éret (“instead of sth., in exchange”), evolved from *ér (“presumably "place"”), a noun of unknown origin extended with -t (“locative suffix”).
in the direction of, to, towards · on account of, according to, because of, due to, for (the purpose of) · against; facing
köken: From Proto-Italic *op, from Proto-Indo-European *h₁epi. Cognate with Ancient Greek ἐπί (epí), Sanskrit अपि (ápi), Avestan 𐬀𐬌𐬞𐬌 (aⁱpi), Old Persian [script needed] (apiy), and Old Armenian եւ (ew). Also related to English by. The accusative is from the pre-PIE directional and the PIE direct object.
for, for the sake of (because of) · on behalf of (speaking or acting for)
köken: Disputed; there are two Old Irish nouns son, one meaning ‘sound; word, name’ (a borrowing from Latin sonus), and one meaning ‘prosperity, well-being’ (cognate with sonae (“happy”) and sonus (“good fortune”)). The connection with sonus was rejected by the Lexique étymologique de l'irlandais ancien, its authors unconvinced on semantic grounds. The Dictionary of the Irish Language associates the…