English definition of “dream”
/drim/ noun (past tense and past participle dreamed, dreamt)
A2 events and images in your mind while you are sleeping: I had a very strange dream last night.
B1 something that you want to happen although it is not very likely: It was his dream to become an actor.
be in a dream › to not notice things that are around you because you are thinking about something else: I didn’t hear what you were saying – I was in a dream.