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Definition of idealism noun from the Oxford Advanced Learner's Dictionary

idealism

noun
 
/aɪˈdiːəlɪzəm/
 
/aɪˈdiːəlɪzəm/
[uncountable]
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  1. the belief that a perfect life, situation, etc. can be achieved, even when this is not very likely
    • He was full of youthful idealism.
    • Idealism has no place in modern politics.
    Topics Politicsc2
  2. (philosophy) the belief that our ideas are the only things that are real and that we can know about compare materialism, realism
  3. Word Originlate 18th cent. (as a philosophical term): from French idéalisme or German Idealismus, from late Latin idealis, via Latin from Greek idea ‘form, pattern’, from the base of idein ‘to see’.
See idealism in the Oxford Advanced American DictionarySee idealism in the Oxford Learner's Dictionary of Academic English
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