Delusion1. (n.) A mistaken belief; as, a delusion of grandeur.
2. (n.) The act of deluding; deception; a misleading of the mind.
3. (n.) That which is falsely or delusively believed or propagated; false belief; error in belief.
Thesaurus Entries
aberrancy, aberration, acting, affectation, agnosia, airy nothing, apparition, appearance, artifice, attitudinizing, autism, bamboozlement, befooling, block, blocking, bluff, bluffing, bubble, calculated deception, casuistry, cheat, cheating, chicane, chicanery, chimera, circumvention, color, coloring, conning, counterfeit, daydream, deceit, deceiving, deception, deceptiveness, defectiveness, defrauding, delirium, deluded belief, delusion of persecution, delusiveness, dereism, deviancy, disguise, disorientation, dissemblance, dissembling, dissimulation, distortion, dream, dream vision, dreamland, dreamworld, dupery, eidolon, enmeshment, ensnarement, entanglement, entrapment, equivocation, errancy, erroneousness, error, facade, face, fake, fakery, faking, fallaciousness, fallacy, false air, false belief, false front, false show, falseness, falsity, fancy, fantasy, fault, faultiness, feigning, feint, figment, flaw, flawedness, flight of ideas, flimflam, flimflammery, fond illusion, fooling, four-flushing, fraud, front, ghost, gilt, gloss, hallucination, hallucinosis, hamartia, heresy, heterodoxy, hoodwinking, humbug, humbuggery, ignis fatuus, illusion, imposture, kidding, masquerade, mental block, mental confusion, meretriciousness, mirage, misapplication, misbelief, misconception, misconstruction, misdoing, misfeasance, misinterpretation, misjudgment, mistake, nihilism, nihilistic delusion, ostentation, outward show, outwitting, overreaching, paralogia, peccancy, perversion, phantasm, phantom, pipe dream, playacting, pose, posing, posture, pretense, pretension, pretext, psychological block, putting on, representation, ruse, seeming, self-contradiction, self-deceit, self-deception, self-delusion, semblance, shade, sham, show, simulacrum, simulation, sin, sinfulness, snow job, song and dance, sophism, sophistry, speciousness, spoofery, spoofing, spuriousness, stratagem, subterfuge, swindling, trick, trickery, trickiness, tricking, trip, unorthodoxy, untrueness, untruth, untruthfulness, vapor, varnish, victimization, vision, willful misconception, window dressing, wishful thinking, wrong, wrong impression, wrongness