noun
absolute idealism
A technical term in philosophy, referring to the idealist system developed by Hegel and related thinkers.
ヘーゲルの絶対的観念論は、現実を精神の自己展開として捉える。
Hegel's absolute idealism conceives of reality as the self-unfolding of spirit.
観念論 is the broader term 'idealism'; 絶対的観念論 specifies the 'absolute' form associated with Hegel.
A compound of 絶対的 (absolute) and 観念論 (idealism), likely a calque from German 'absoluter Idealismus' or English 'absolute idealism'.