- 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(philosophy) the belief that our ideas are the only things that are real and that we can know about compare materialism, realism
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NAmE//aɪˈdiəlɪst//noun He's too much of an idealist for this government.