Proficiency :: Proficiency (n.) The quality of state of being proficient; advance in the acquisition of any art, science, or knowledge; progression in knowledge; improvement; adeptness; as, to acquire proficiency in music..
Proficient :: Proficient (n.) 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..
Proficient :: Proficient (a.) Well advanced in any branch of knowledge or skill; possessed of considerable acquirements; well-skilled; versed; adept,.