Pronunciation: (men'tl-iz"um), [key]
1. the doctrine that objects of knowledge have no existence except in the mind of the perceiver.
2. the doctrine that human conduct reflects the operation of a nonmaterial principle.
3. any psychological theory that accepts as a proper subject of study the mental basis for human behavior. Cf. behaviorism.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.