\a͡ɪdˈi͡əz], \aɪdˈiəz], \aɪ_d_ˈiə_z]\
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[Gr.] In the Platonic philosophy, the eternal prototypes of being, and the efficient cause of all that is. Of these ideas there is necessarily an indefinite number, for since every generic and specific concept is according to Plato substantial, there must be as many ideas as there are genera and species.-Zeller, Plato and the Older Academy.
By Henry Percy Smith