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n.1.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.
References in periodicals archive ?
Francis Bacon, Of the Proficience and Advancement of Learning, I, vi.
The second was from Bacon's Advancement of Learning: "To conclude, therefore, let no man out of a weak conceit of sobriety, or an ill-applied moderation, think or maintain, that a man can search too far or be too well studied in the book of God's word, or in the book of God's works; divinity or philosophy; but rather let men endeavour an endless progress or proficience in both.
Of the proficience and advancement of Learning, divine and human (1605)--where "proficience" has the older sense of an "Improvement in skill or knowledge; progress.