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delusion

Delusion refers to some firm belief you have that is actually not grounded in reality or truth, often occurring as a result of a mental problem. (noun)

When you hear voices in your head and believe they are the voice of the President or the voice of Jesus communicating personally with you, this is an example of a delusion.

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See delusion in Webster's New World College Dictionary

See delusion in American Heritage Dictionary 4

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