noun
Philosophical term for an idea, often in the context of German idealism or related thought. Not a general-purpose word for 'idea' in everyday Japanese.
from German Idee
See also: 理念
カントの哲学では、イデーは経験を超えた理性の概念を指す。
In Kant's philosophy, 'Idee' refers to a concept of reason that transcends experience.