[noun] [U]Idealism is the belief that ideals can be achieved.She never lost her youthful idealism and campaigned for just causes all her life.Experienced teachers are well aware of the conflict between idealism and everyday life in the classroom.Compare realism at real (NOT IMAGINARY).(specialized) In philosophy idealism is the belief that objects in the world are ideas which only exist in the mind of God or people who see them.
IDEALISM
Meaning of IDEALISM in English
Cambridge English vocab. Кембриджский английский словарь. 2012