something that deceives by producing a false or misleading impression of reality.

the state or condition of being deceived; misapprehension.

an instance of being deceived.

Psychology . a perception, as of visual stimuli (optical illusion), that represents what is perceived in a way different from the way it is in reality.

a very thin, delicate tulle of silk or nylon having a cobwebbed appearance, for trimmings, veilings, and the like.

Obsolete . the act of deceiving; deception; delusion.

noun

certainty , event , fact , reality , truth

noun

apparition , bubble * , chimera , confusion , daydream , deception , dj vu , delusion , error , fallacy , false impression , fancy , fantasy , figment of imagination , fool’s paradise , ghost , hallucination , head trip , hocus-pocus * , idolism , ignus fatuus , image , invention , make-believe , mirage , misapprehension , misbelief , misconception , misimpression , mockery , myth , optical illusion , paramnesia , phantasm , pipe dream * , rainbow * , seeming , semblance , trip * , virtual realitynotes:allusion is an \'indirect mention , \' illusion is \'false impression , [[\' and delusion is \'deception\' which is much stronger than illusionan illusion is an image or conception of something actual or real that presents itself to the mind in an abnormal or distorted manner; a delusion is a false belief about oneself or other people that persists despite its being at variance with the facts]] , ignis fatuus , phantasma , will-o\'-the-wisp , fiction , figment , reverie , vision , bubble , castle in the air , dream , pipe dream , rainbow , aberration , anamorphosis , fata morgana , glamour , phantom , phenomenon , revenant , specter , spectrum