illusion

noun4

1. •
   a trick of the eyes or ears that makes something real seem different from how it truly is

   • We saw what looked like a tiger among the trees, but it was an illusion caused by the shadows of the branches.
   • Using artificial additives, scientists can create the illusion of fruit flavours in food.
2. •
   A misapprehension; a belief in something that is in fact not true.

   • Jane has this illusion that John is in love with her.
3. •
   The state of being deceived or misled.
4. •
   A magician’s trick.