illusion - definition and synonyms

noun [countable] 

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  1. 1
    a false or wrong belief or idea
    illusion that:

    Many people still have the illusion that full employment is possible.

    create/give/maintain the illusion:

    This description creates the illusion that we can solve all our environmental problems.

    be under no illusion/illusions (=not have a false idea):

    We are under no illusion that this money will be enough.

    have no illusions (=realize that something is difficult or unpleasant):

    I had no illusions about the task that lay ahead.

  2. 2
    an appearance or effect that is different from the way that things really are

    For some time, Yeltsin’s rule provided an illusion of stability.

    give/create the illusion of something:

    Glass bricks in the bathroom gave the illusion of lightness and space.