American English

Definition of idealism noun from the Oxford Advanced American Dictionary



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  1. 1the 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.
  2. 2(philosophy) the belief that our ideas are the only things that are real and that we can know about compare materialism, realism
noun He's too much of an idealist for this government.
See the Oxford Advanced Learner's Dictionary entry: idealism