rev ‧ e ‧ rie /ˈrevəri/ BrE AmE noun [uncountable and countable]
[ Date: 1600-1700 ; Language: French ; Origin: rêverie , from Old French rever 'to wander, dream' ]
a state of imagining or thinking about pleasant things, that is like dreaming ⇨ daydream :
She was startled out of her reverie by a loud crash.
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THESAURUS
■ when you are sleeping
▪ dream the thoughts, images, and feelings that go through your mind while you are asleep:
I had a strange dream last night -- you and I were in some sort of forest.
▪ nightmare a very unpleasant and frightening dream:
She still has terrible nightmares about the accident.
▪ daydream a series of pleasant thoughts that go through your mind when you are awake, so that you do not notice what is happening around you:
Neil was in a daydream, and didn’t hear the teacher call his name.
▪ reverie formal a state of imagining or thinking about pleasant things, that is like dreaming:
The doorbell rang, shaking her from her reverie.