idealism

noun
1
the belief that a perfect life, situation, etc. can be achieved, even when this is not very likely
آرمان‌گرایی, ایده‌آلیسم
2
the belief that our ideas are the only things that are real and that we can know about
ایده‌آلیسم, ایدئالیسم
compare materialism, realism