Proficient Definition

prə-fĭshənt

adjective

Having or marked by an advanced degree of competence, as in an art, vocation, profession, or branch of learning.

American Heritage

Highly competent; skilled; adept.

Webster's New World

Good at; skilled; fluent; practiced, especially in relation to a task or skill.

He was a proficient writer with an interest in human nature.

Wiktionary

Synonyms:

Antonyms:

noun

A person who exhibits such competence; an expert.

American Heritage

Synonyms:

Other Word Forms of Proficient

Singular:

proficient

Plural:

proficients

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.

From Wiktionary
Latin prōficiēns prōficient- present participle of prōficere to make progress profit

From American Heritage Dictionary of the English Language, 5th Edition