This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An erroneous perception of reality.

n. An erroneous concept or belief.

n. The condition of being deceived by a false perception or belief.

n. Something, such as a fantastic plan or desire, that causes an erroneous belief or perception.

n. Illusionism in art.

n. A fine transparent cloth, used for dresses or trimmings.

n. Anything that seems to be something that it is not.

n. A misapprehension; a belief in something that is in fact not true.

n. A magician’s trick.

n. this sense?) (uncountable) The fact of being an illusion (in any of the above senses).

n. An unreal image presented to the bodily or mental vision; a deceptive appearance; a false show; mockery; hallucination.

n. Hence: Anything agreeably fascinating and charming; enchantment; witchery; glamour.

n. A sensation originated by some external object, but so modified as in any way to lead to an erroneous perception; as when the rolling of a wagon is mistaken for thunder.

n. A plain, delicate lace, usually of silk, used for veils, scarfs, dresses, etc.

n. That which illudes or deceives; an unreal vision presented to the bodily or mental eye; deceptive appearance; false show.

n. Specifically In psychology, a false perception due to the modification of a true perception by the imagination: distinguished from false appearances due to the imperfection of the bodily organs of sense, such as irradiation, and from hallucinations, into which no true perception enters. See hallucination, 2.

n. The act of deceiving or imposing upon any one; deception; delusion; mockery.

n. A thin and very transparent kind of tulle.

n.

n. In the pictorial arts, an imitation of the appearance of nature which is intended to create the impression of reality.

n. an erroneous mental representation

n. an illusory feat; considered magical by naive observers

n. something many people believe that is false

n. the act of deluding; deception by creating illusory ideas

"Of course the symptoms are occurring: the term illusion refers to our interpretation of the meaning of the physical symptoms, not the existence of physical symptoms per se."

deception    dissimulation    dissembling    deceit   

deception    arrow-head and feather illusion    fantastic illusion    von recklinghausen's illusion    physiological illusion    mirage   

illusory    illusionist    under the illusion    optical illusion   

deception    chimera    mockery    fallacy    delusion    hallucination    enchantment    witchery    glamour   

allusion    collusion    conclusion    confusion    contusion    delusion    diffusion    disillusion    exclusion    extrusion   

delusion    vision    impression    notion    reality    mystery    emotion    manifestation    impulse    suggestion