Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Good at; skilled; fluent; practiced, especially in relation to a task or skill.
  • n. An expert.

from the GNU version of the Collaborative International Dictionary of English

  • n. One who has made considerable advances in any business, art, science, or branch of learning; an expert; an adept
  • adj. Well advanced in any branch of knowledge or skill; possessed of considerable acquirements; well-skilled; versed; adept

from The Century Dictionary and Cyclopedia

  • Well versed in any business, art, science, or branch of learning; skilled; qualified; competent: as, a proficient architect.
  • n. One who has made considerable advance in any business, art, science, or branch of learning; an adept; an expert: as, a proficient in a trade or occupation.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. of or relating to technique or proficiency in a practical skill
  • adj. having or showing knowledge and skill and aptitude

Etymologies

Latin prōficiēns, prōficient-, present participle of prōficere, to make progress; see profit.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin proficiens, present participle of proficere ("to go forward, advance, make progress, succeed, be profitable or useful"), from pro ("forth, forward") + facere ("to make, do"); see fact. (Wiktionary)

Examples

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