イデア

noun

idea (Platonic); Form

Philosophical term referring to the eternal, perfect Forms or Ideas in Plato's theory. Not used for everyday 'idea' (that is アイデア or 考え).

from Greek

• プラトンは、この世よのものはイデアの不ふ完かん全ぜんな模も造ぞうだと考かんがえた。

  Plato thought that things in this world are imperfect copies of the Forms.