One who has made considerable advances in any business, art, science, or branch of learning; an expert; an adept; as, proficient in a trade; a proficient in mathematics, music, etc.
Well advanced in any branch of knowledge or skill; possessed of considerable acquirements; well-skilled; versed; adept,
2015年11月29日 — assessment of teachers' classroom language proficiency ... Interlanguage Pragmatic Knowledge of EFL Learners was published by Peter Lang.