illusion
illusion /ɪˈluː.ʒən/ noun
1 C2 [C or U] an idea or belief that is not true: » He had no illusions about his talents as a singer.» I'm under no illusions (= I understand the truth) about the man I married.» My boss is labouring under the illusion that (= wrongly believes that) the project will be completed on time.Thesaurus+: ↑Unreal things and unreality2 C2 [C] something that is not really what it seems to be: » A large mirror in a room can create the illusion of space.» The impression of calm in the office is just an illusion.Thesaurus+: ↑Hiding and disguising |