proficiency Copy link • proficiency: expr. by progressus, ūs: he had such p. in the Stoic philosophy, that ..., tantos p. habebat in Stoicis, Cic. N. D. 1, 6, fin. So processus, ūs: Auct. in Suet. Gr. 10 (in Graecis litteris magnum processum habere); and, profectus, ūs: Sen. Ep. 11, init. Phr.: to attain p. in philosophy, in philosophia proficere aliquid, Cic. Off. 3, 8, fin.: as to your p., quantum proficias, id.