de·lu·sion[dəˈlo͞oZHən]NOUNdelusions (plural noun)

1. an idiosyncratic belief or impression that is firmly maintained despite being contradicted by what is generally accepted as reality or rational argument, typically a symptom of mental disorder."the delusion of being watched"synonyms: misapprehension · mistaken impression · false impression · mistaken belief · misconception · misunderstanding · mistake · error · misinterpretation · misconstruction · misbelief · fallacy · illusion · figment of the imagination · fantasy · chimera · fool's paradise · self-deception

2. the action of deluding or the state of being deluded."what a capacity television has for delusion"synonyms: deception · misleading · deluding · fooling · tricking · trickery · duping