Pronunciation: (di-lOO'zhun), [key]
1. an act or instance of deluding.
2. the state of being deluded.
3. a false belief or opinion: delusions of grandeur.
4. Psychiatry.a fixed false belief that is resistant to reason or confrontation with actual fact: a paranoid delusion.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.