Citations:ideæ

Noun: antiquated and uncommon plural of

 * 1838, Heinrich Ritter and Alexander James William Morrison, The History of Ancient Philosophy, D. A. Talboys; volume II, chapter III, pages 292–293:
 * Plato, therefore, does not hesitate to describe the sensible as a compound of the identical which indicates the Ideæ, and of the other, or the non-being; 163 and as he considers the changeable to be the object‐matter of vague opinion, he places it intermediate between ignorance and knowledge, so that it thus appears to be a something which at the same time is and is not.
 * 1842, The Biographical Dictionary of the Society for the Diffusion of Useful Knowledge, Longman, Brown, Green, and Longmans; volume I, page #30:
 * “ Plato laid it down that there were certain ideæ, that is, species incorporeal, and substances permanent and in themselves distinct from other things in their nature, as for instance Man ; and that by their participation in these ideæ, other things became men or animals.”
 * 1914, Wilhelm Windelband, A History of Philosophy, The Macmillan Company; part III, chapter 2, § 25, page #326:
 * Things are other than our ideas (ideæ) of them.