Denshi Jisho — Online Japanese dictionary

理想 risou ideal; dream
Common word, Noun, No-adjective 
理想化 risouka idealization; idealisation
Noun, Suru verb 
理想家 risouka idealist
Noun 
理想的 risouteki ideal
Common word, Na-adjective 
理想型 risoukei ideal type
Noun 
理想像 risouzou idealized image
Noun 
理想論 risouron idealistic thought (argument)
Noun 
理想郷 risoukyou ideal land; earthly paradise; Utopia; Arcadia
Noun 
理想気体 risoukitai ideal gas; perfect gas
Noun 
理想主義 risoushugi idealism
Noun, No-adjective 
理想的な言語使用者 risoutekinagengoshiyousha ideal speaker-hearer
Noun 

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