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synesthesia

American  
[sin-uhs-thee-zhuh, -zhee-uh, -zee-uh] / ˌsɪn əsˈθi ʒə, -ʒi ə, -zi ə /

noun

synesthesias plural
  1. a sensation produced in one modality when a stimulus is applied to another modality, as when the hearing of a certain sound induces the visualization of a certain color.


synesthesia British  
/ ˌsɪniːsˈθɛtɪk, ˌsɪniːsˈθiːzɪə /

noun

  1. the usual US spelling of synaesthesia

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Derived Forms

Inflected Forms

Nouns

Etymology

Origin of synesthesia

First recorded in 1890–95; from New Latin; see origin at syn-, esthesia

Explanation

Synesthesia is a condition that happens when a sense, such as sight, triggers another sense, like smell, at the same time. For someone with synesthesia, each letter of the alphabet might have a different odor. Cool! Synesthesia happens when someone’s senses are blended. The word synesthesia comes from the Greek syn for “together” and the root aisthe for “to feel.” People with synesthesia often don’t realize at first that they have it — they think everyone sees the number 8 as red, for example! The writer Vladimir Nabokov writes about having synesthesia in his memoir Speak, Memory. Synesthesia is another way of perceiving the world, but it’s not a disease.

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Vocabulary lists containing synesthesia

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

“And then synesthesia would be … these rare individuals who experience additional sensations that sometimes happen to be across the senses, but most commonly sight,” Spence told Salon in a video interview.

From Salon Feb. 15, 2025

But you need a director who can translate a synesthesia vision onto the stage.

From Los Angeles Times Mar. 6, 2024

You’ll notice the way synesthesia guides his pen, and you’ll pick up his themes of exile, wonder, the afterlife and the privacy and primacy of marriage.

From New York Times Oct. 15, 2023

To demonstrate the capabilities of this synesthesia display, the research team presented two innovative applications.

From Science Daily Oct. 12, 2023

“Do you mean that everyone who has this synesthesia condition has all of these traits?” my mother asks, clearly skeptical.

From "A Mango-Shaped Space" by Wendy Mass

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