n. [ L. proficiens, -entis, p. pr. of proficere to go forward, make progress; pro forward + facere to make. See Fact, and cf. Profit, (&unr_;) ] One who has made considerable advances in any business, art, science, or branch of learning; an expert; an adept;
a. Well advanced in any branch of knowledge or skill; possessed of considerable acquirements; well-skilled; versed; adept, [ 1913 Webster ]
adv. In a proficient manner. [ 1913 Webster ]