Idea, æ. pe. cor, Forma. figura species rerum prima & inchoata intelligentia. Cic.The figure couceiued in Imagination, as it were a substance perpetuall, being as parerne of all other forte or kinde, as of one seale proceedeth many priutes, so of one Idea of man proceede many thousands of men.
Lewis and Short: Latin dictionary
ĭdĕa, ae, f., = ide/a, 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).