Definition from macmillandictionary.com
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Many people still have the illusion that full employment is possible.
This description creates the illusion that we can solve all our environmental problems.
We are under no illusion that this money will be enough.
I had no illusions about the task that lay ahead.
For some time, Yeltsin’s rule provided an illusion of stability.
Glass bricks in the bathroom gave the illusion of lightness and space.