noun, noun or participle which takes 'suru', transitive verb
Refers to a fanciful or unrealistic dream, vision, or daydream, often with a literary or poetic nuance. Can be used as a noun or with する to mean 'to dream' or 'to have a vision'.
彼は世界平和の夢想にふけっている。
He is lost in a dream of world peace.
そんなことは夢想だにしなかった。
I never even dreamed of such a thing.