ĭdĕa, ae, f., = ἰδέα,
a ( Platonic ) idea , archetype , Sen. Ep. 58 med. (in Cic. Or. 3, 10; id. Ac. 1, 8, 30; id. Tusc. 1, 24, 58, as Greek).
·noun A plan or purpose of action; intention; design. II. Idea ·noun A general notion, or a concept...
Webster's Dictionary of the English Language
The knowledge box, the head. See knowledge box. ...
Dictionary of The Vulgar Tongue by Francis Grose