illusion

/ɪˈluːʒən/
noun
  1. A false idea or belief, especially about someone or a situation.
    • The idea of perfect happiness is an illusion that many people chase.
    • She had no illusions about how difficult the job would be.
    • He was under the illusion that he could finish the project in one day.
  2. Something that deceives the senses or mind, like a magic trick or optical trick.
    • The painting used perspective to give the illusion of depth.
    • The magician created the illusion that the coin had vanished.
    • The mirror maze was full of optical illusions that confused visitors.
Antonyms
What does "illusion" mean? | whatsthatwordmean | whatsthatwordmean