PROFICIENT n. 2 definitions
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.
PSYCHOLOGY n.
The science of the human soul; specifically, the systematic or scientific knowledge of the powers and functions of the human soul, so far as they are known by consciousness; a treatise on the human soul. Psychology, the science conversant about the phenomena of the mind, or conscious subject, or self. Sir W. Hamilton.…
QUICHUAN a.
zations, characterized by agricultural, military, and administrative skill rather than by science or literature, although they were adept potters, weavers, and goldsmiths, and preserved by the aid of the mnemonic quipu a body of legendary lore in part written down since the introduction of writing.