1. (n.) The act of hallucinating; a wandering of the mind; error; mistake; a blunder.

2. (n.) The perception of objects which have no reality, or of sensations which have no corresponding external cause, arising from disorder or the nervous system, as in delirium tremens; delusion.

aberration agnosia apparition bamboozlement befooling block blocking bluffing brainchild bubble calculated deception chimera circumvention conning deceiving deception deceptiveness defrauding delirium delirium tremens delusion delusion of persecution delusiveness disorientation dream dupery eidolon enmeshment ensnarement entanglement entrapment fallaciousness fallacy falseness fancy fantasque fantasy fata morgana fiction figment flight of ideas flimflam flimflammery fond illusion fooling ghost hallucinosis hoodwinking idle fancy illusion imagery imagination imagining insubstantial image invention kidding maggot make-believe mental block mental confusion mind-expansion mirage myth nihilism nihilistic delusion outwitting overreaching paralogia phantasm phantom psychological block putting on romance self-deception sick fancy snow job song and dance spoofery spoofing subterfuge swindling thick-coming fancies trickiness tricking trip tripping vapor victimization vision whim whimsy wildest dreams willful misconception wishful thinking wraith