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Definition of Illusion

Babylon English

delusion, false impression of reality; misconception, false idea
Illusion Definition from Arts & Humanities Dictionaries & Glossaries
Kant Glossary
[B69] In the Aesthetic Kant denies that the transcendental ideality of space entails that objects in time and space are mere illusion. Thus he opposes to appearances both illusion and things in themselves. Appearances are not illusory because "in an appearance the objects, nay even the properties that we ascribe to them, are always regarded as something given". It is by denying the ideality of space and time--asserting their objective reality--that "appearances...are transformed into mere illusion"; Kant suggests that this position motivates Berkeley's idealism. [A293/B349] Kant calls "dialectic in general a logic of illusion". In opposition to optical illusion ("empirical illusion"), the dialectic is concerned with transcendental illusion, whereby "in defiance of all the warnings of criticism...[we are carried] beyond the empirical employment of categories" to a bogus transcendental or transcendent employment of concepts. [A339/B397] Kant also opposes transcendental illusion and error, writing of transcendental illusions "even the wisest of men cannot free himself from them. After long effort he perhaps succeeds in guarding himself against actual error; but he will never be able to free himself from the illusion, which unceasingly mocks and torments him".
Illusion Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
Hence: Anything agreeably fascinating and charning; enchantment; witchery; glamour.
An unreal image presented to the bodily or mental vision; a deceptive appearance; a false show; mockery; hallucination.
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.
A plain, delicate lace, usually of silk, used for veils, scarfs, dresses, etc.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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An unreal image presented to the senses.
Concise English-Irish Dictionary v. 1.1
English Phonetics
JM Welsh <=> English Dictionary
Geuwedd = n. an illusion
Gorhudd = n. extreme illusion
Gorith = n. phantom, illusion
Hud = n. an illusion, a charm
Lledrith = n. illusion, disguise
WordNet 2.0

1. an erroneous mental representation
(synonym) semblance
(hypernym) appearance
(hyponym) apparition, phantom, phantasm, phantasma, shadow
2. something many people believe that is false; "they have the illusion that I am very wealthy"
(synonym) fantasy, phantasy, fancy
(hypernym) misconception
(hyponym) bubble
3. the act of deluding; deception by creating illusory ideas
(synonym) delusion, head game
(hypernym) deception, deceit, dissembling, dissimulation
4. an illusory feat; considered magical by naive observers
(synonym) magic trick, conjuring trick, trick, magic, legerdemain, conjuration, deception
(hypernym) performance
(hyponym) card trick
Illusion Definition from Social Science Dictionaries & Glossaries
Dream Quotations
What is life? An illusion, a shadow, a story, And the greatest good is little enough: for all life is a dream, and dreams themselves are only dreams.
Illusion Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
An illusion is a distortion of the senses, revealing how the brain normally organizes and interprets sensory stimulation. Though illusions distort reality, they are generally shared by most people. Illusions may occur with any of the human senses, but visual illusions (optical illusions), are the most well-known and understood. The emphasis on visual illusions occurs because vision often dominates the other senses. For example, individuals watching a ventriloquist will perceive the voice is coming from the dummy since they are able to see the dummy mouth the words. Some illusions are based on general assumptions the brain makes during perception. These assumptions are made using organizational principles (e.g., Gestalt theory), an individual's capacity for depth perception and motion perception, and perceptual constancy. Other illusions occur because of biological sensory structures within the human body or conditions outside of the body within one’s physical environment.

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Illusion Definition from Religion & Spirituality Dictionaries & Glossaries
Illusion Positive unreality, or that which is wholly and completely deceptive without basis in reality; as such some philosophers consider it to be rooted in the human mind itself, subjective or interior rather than external or objective. As thus understood, illusion falls far short of the significance of the Sanskrit maya, for which it is used as a translation. For the sense of maya is that of appearance rising out of reality, not something opposed to reality. It is evident that, if the universe can be said to exist at all, we must allow that illusion in the sense of maya has existence, a relative or temporary reality, for it obviously originates from and shadows forth the reality within and behind it. It is not that reality itself, but its multiform appearances. To say that the world in which we live, and all the people and beings and things in it, are an illusion, does not mean that all this is an empty dream; it means that what is so real to us, as long as we are conscious on this plane, will be seen as a maya or deceptive appearance from our viewpoint when we become conscious on a higher and more inclusive plane. See also Maya