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a mental impression or conception.
autochthonous idea a persistent idea, originating within the mind, usually from the unconscious, but seeming to have come from an outside source and often therefore felt to be of malevolent origin.
dominant idea one that controls or colors every action and thought.
fixed idea a persistent morbid impression or belief that cannot be changed by reason.
overvalued idea a false or exaggerated belief sustained beyond logic or reason but with less rigidity than a delusion, also often being less patently unbelievable.
idea of reference the incorrect idea that the words and actions of others refer to one's self, or the projection of the causes of one's own imaginary difficulties upon someone else.
A thought that comes into the mind independent of a train of thoughts, in an unaccountable way.
See also: idea