• WordNet 3.6
    • n illusion an illusory feat; considered magical by naive observers
    • n illusion the act of deluding; deception by creating illusory ideas
    • n illusion something many people believe that is false "they have the illusion that I am very wealthy"
    • n illusion an erroneous mental representation
    • ***
Webster's Revised Unabridged Dictionary
    • Illusion A plain, delicate lace, usually of silk, used for veils, scarfs, dresses, etc.
    • Illusion (Physiol) 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.
    • Illusion An unreal image presented to the bodily or mental vision; a deceptive appearance; a false show; mockery; hallucination. "To cheat the eye with blear illusions ."
    • Illusion Hence: Anything agreeably fascinating and charming; enchantment; witchery; glamour. "Ye soft illusions , dear deceits, arise!"
    • ***
Century Dictionary and Cyclopedia
    • n illusion That which illudes or deceives; an unreal vision presented to the bodily or mental eye; deceptive appearance; false show.
    • n illusion 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 illusion The act of deceiving or imposing upon any one; deception; delusion; mockery.
    • n illusion A thin and very transparent kind of tulle.
    • n illusion In the pictorial arts, an imitation of the appearance of nature which is intended to create the impression of reality.
    • ***
Chambers's Twentieth Century Dictionary
    • n Illusion il-lū′zhun a playing upon: a mocking: deceptive appearance: false show: error
    • ***


  • Ralph Waldo Emerson
    “The most dangerous thing is illusion.”
  • Sebastien-Roch Nicolas De Chamfort
    “Pleasure can be supported by an illusion; but happiness rests upon truth.”
  • Arthur Koestler
    “Nothing is more sad than the death of an illusion.”
  • Henry Wadsworth Longfellow
    “Therefore trust to thy heart, and to what the world calls illusions.”
  • Oscar Wilde
    “The one person who has more illusions than the dreamer is the man of action.”
  • Orson Welles
    “We're born alone, we live alone, we die alone. Only through our love and friendship can we create the illusion for the moment that we're not alone.”


Webster's Revised Unabridged Dictionary
F. illusion, L. illusio, fr. illu,dere, illusum, to illude. See Illude
Chambers's Twentieth Century Dictionary
See Illude.


In literature:

Caswallawn had flung upon him the Veil of Illusion, so that no one could see him slay the men, but the sword only could they see.
"The Mabinogion Vol. 3 (of 3)"
Persons can retain a hobby or an illusion for a time or for all time.
"Watch Yourself Go By" by Al. G. Field
I sat up in bed; frightened at the wild confusion of my brain, I passed my hands over my eyes to remove the illusion, but in vain.
"Ernest Linwood" by Caroline Lee Hentz
The number of illusions of vision is remarkable.
"The Story of the Mind" by James Mark Baldwin
A dazzling light that clears away all misty illusions, but my eyes are strong enough to bear it!
"The Home" by Fredrika Bremer
The Terran had no illusions concerning his own marksmanship.
"Storm Over Warlock" by Andre Norton
How can we recognize Good as being an illusion?
"The Status Civilization" by Robert Sheckley
The reassuring illusion of reality came back like a clap of thunder.
"Clayhanger" by Arnold Bennett
My daemon seemed averse to answering any questions on the topic of these illusions.
"The Atlantic Monthly , Volume 2, No. 14, December 1858" by Various
The garden, she realized suddenly, might be an illusion scene.
"Legacy" by James H Schmitz

In poetry:

Shadows and illusions meet us,
Visions cheat our longing eyes;
But the substance hope has promis'd,
Shall repay each sacrifice.
"To Hope" by Elizabeth Bath
“’Robbed, robbed of life’s illusions sweet;
Love dead outside her closèd door,
And passion fainting at her feet
To wake no more;
"The Letter L" by Jean Ingelow
Life's a varied, bright illusion,
Joy and sorrow—-light and shade;
Turn from sorrow's dark suffusion,
Catch the pleasures ere they fade.
"Song~" by Ann Radcliffe
But, if by vain self-love misled,
Thou in my looks canst passion see;
And think, by weak illusions fed,
My towering hopes aspire to thee….
"To Lothario" by Amelia Opie
The middle of the things I know
Is the unknown, and circling it
Life's truth and life's illusion show
Things in the terms of sense and wit.
"Within The Temple" by Thomas MacDonagh
Ah, what booteth sweet illusion,
Fluttering glance, and soft suffusion,
Bliss unknown, but felt in sighs,
Breast, that shrinks at its own rise?
"Lita of the Nile" by Richard Doddridge Blackmore

In news:

Runs at Grand Illusion, Fri. Not rated 76 minutes.
Take it from a man who has fried endless number of IF transformers, transistors and dummy loads in an inept illusive quest for accurate RF information and tuning.
The Wittgenstein Illusion from the June 11, 2009 issue.
Gary Soto, Author, Terry Widener , Illustrator, illus.
When creative works are presented to the public, the illusion of a seamlessness is a necessary factor.
There were no illusions, no trying to explain away why they had lost to the reigning world champs.
Tony Johnston, Author, Stacy Innerst, Illustrator, illus.
The Great Illusion of Gettysburg.
In a post-industrial culture of digital manipulation, reality often becomes an illusion.
Show combines dance, acrobats and illusion.
The Illusion of Abundance .
Financial illusions of the war.
I Have a Dream by Martin Luther King Jr, illus.
What Is the Ames Illusion.
The exhibit's centerpiece will be a large 3-D Zoetrope, a device that produces the illusion of motion from a rapid succession of static pictures.

In science:

We have no illusion that (17) could be valid in the limit T → Tc , since α(Tc) = 1, by definition.
Critical Behavior of Hadronic Fluctuations and the Effect of Final-State Randomization
The effect is an illusion resulting from two coincidences.
The End of the Lines for OX 169: No Binary Broad-Line Region
Reflective memory uses memory-mapped I/O to provide the illusion of a memoryattached interconnection.
Cluster Computing White Paper
Middleware systems have done an excellent job of providing the illusion of homogeneity in heterogeneous systems – consider the success of Java and the Java Virtual Machine.
Cluster Computing White Paper
However, creating illusions does cost in terms of performance.
Cluster Computing White Paper