well-advanced or competent in any art, science, or subject; skilled: a proficient swimmer.
–noun
2.
an expert.
Origin: 1580–90; < L prōficient- (s. of prōficiēns) prp. of prōficere to advance, make progress, equiv. to prō-pro-1+ -ficere, comb. form of facere to make, do1. See -ent, efficient
pro·fi·cient (prə-fĭsh'ənt) adj. Having or marked by an advanced degree of competence, as in an art, vocation, profession, or branch of learning. n. An expert; an adept.
[Latin prōficiēns, prōficient-, present participle of prōficere, to make progress; see profit.] pro·fi'cient·ly adv.
Synonyms: These adjectives mean having or showing knowledge, ability, or skill, as in a profession or field of study. Proficient implies an advanced degree of competence acquired through training: is proficient in Greek and Latin. Adept suggests a natural aptitude improved by practice: became adept at cutting the fabric without using a pattern. Skilled implies sound, thorough competence and often mastery, as in an art, craft, or trade: a skilled gymnast who won an Olympic medal. Skillful adds to skilled the idea of natural dexterity in performance or achievement: is skillful in the use of the hand loom. Expert applies to one with consummate skill and command: an expert violinist who played the sonata flawlessly.