A common prefix in words derived from Latin or French; e.g., probleme, processionarie, progenitour, pronosticacioun, propugnacle, prosperite, provincial (nouns); profounde, prolixe, propicious, proporcional, proscript, prostrate, provident (adj.); proceden, procuren, prolongen, promoten, prorogen, protenden, providen (verbs); etc. Pronoun n. & prospeden v. are apparently ME formations modeled after foreign words of similar meaning. pro- is frequently substituted for other prefixes: (for par-) profit, profyȝt, vars. of parfit; profitely, profitelich, vars. of parfitli; profitenesse, var. of parfitnesse; (for per-) provertli, adv.; profeccion, var. of perfeccioun; promutacioun, var. of permutacioun; prosecute, var. of persecuten; prospectif, prospective, vars. of perspectif; (for pre-) prodestinat, p.ppl. of predestinaten; proferre, var. of preferren; projedise, var. of prejudice; propotent, var. of prepotent; prorogative, var. of prerogatif; prosumpcion, var. of presumpcioun; provaile, var. of prevailen; provailis, pl. ind. of prevailen; (for pur-) proportes, sg.3 of purporten; proseuede, p. of purseuen; provei, var. of purveien, proveide, p. of purveien; proviaunce, var. of purveiaunce; proviour, provour, prowiour, vars. of purveiour; etc.