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top: straight horizontal rules appear curved
bottom: a gray box against a black background appears lighter than the same gray box against a white background


a. An erroneous perception of reality: Mirrors gave the illusion of spaciousness.
b. An erroneous concept or belief: The notion that money can buy happiness is an illusion.
2. The condition of being deceived by a false perception or belief: spent months flailing about in illusion.
3. Something that is erroneously perceived or construed: The animal in the shadows turned out to be an illusion.
4. A fine transparent net fabric, used for dresses or trimmings.

[Middle English illusioun, from Old French, from Late Latin illūsiō, illūsiōn-, from Latin, a mocking, irony, from illūsus, past participle of illūdere, to mock : in-, against; see in-2 + lūdere, to play; see leid- in Indo-European roots.]

il·lu′sion·al, il·lu′sion·ar′y (-zhə-nĕr′ē) adj.
il·lu′sion·less adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.illusional - marked by or producing illusion; "illusionary stage effects"
unreal - lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria; "ghosts and other unreal entities"; "unreal propaganda serving as news"
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References in periodicals archive ?
Using magic, puppets, stories and music, Curt Nelson of Slightly Illusional will help children discover cryptic codes and messages to help them interpret and explore the world around them.
Shed the illusional pounds by wearing vertical stripes with a deep v- neck.
Because large bodies of water can create an illusional effect, a submerged child might not be spotted from a certain angle, Berry said.
Children are invited to enjoy magic, puppets, music, books and storytelling, with lots of audience participation, all in one event, when Slightly Illusional presents "Set Sail
if only people did their jobs as given by law and conscience and not give into powers that be -- illusional or real.
Sabrina the Teenage Stitch - also know as Sabrina Bourgoin - worked her magic to create an illusional portrait of the TV star, from strands of wool.