1300-50;Middle Englishap(p)rentis < Anglo-French,Old Frenchap(p)rentiz < Vulgar Latin*apprenditīcius, equivalent to *apprendit(us) (for Latinapprehēnsus; see apprehensible) + Latin-īcius suffix forming adjectives from past participles, here nominalized
c.1300, from O.Fr. aprentiz "someone learning" (13c.), from aprendre (Mod.Fr. apprendre) "to learn, teach," contracted from L. apprehendere (see apprehend). Aphetic form prentice was long more usual in English. The verb is first attested 1630s.