Learn how to say Illusions correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word illusion:
an instance of a wrong or misinterpreted perception of a sensory experience:
stripes embellish the surface to create the illusion of various wood-grain textures
a deceptive appearance or impression:
the illusion of family togetherness
a false idea or belief:
he had no illusions about the trouble she was in
be under the illusion that
believe mistakenly that:
the world is under the illusion that the original painting still hangs in the Winter Palace
be under no illusion (or illusions)
be fully aware of the true state of affairs.