imaginary
Americanadjective
noun
adjective
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existing in the imagination; unreal; illusory
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maths involving or containing imaginary numbers. The imaginary part of a complex number, z, is usually written Im z
Other Word Forms
Derived Forms
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imaginarinessnoun
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nonimaginarilynessnoun
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nonimaginarinessnoun
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nonimaginaryadjective
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preimaginaryadjective
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unimaginaryadjective
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imaginarilyadverb
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nonimaginarilyadverb
Inflected Forms
Nouns
Etymology
Origin of imaginary
1350–1400; Middle English < Latin imāginārius, equivalent to imāgin-, (stem of imāgō ) image + -ārius -ary
Explanation
Anything imaginary is not real: it only exists in someone's head. We hate to ruin your day, but unicorns are imaginary. Our imagination allows us to think of anything we want, and things that only exist in our minds are imaginary. Many children have imaginary friends: people they talk to who aren't real. Mythological beings like dragons, Zeus, and Thor are imaginary. A fantasy about marrying a movie star is probably imaginary, because that isn't likely to happen.
Vocabulary lists containing imaginary
List 1
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Common Core Grade 6, List 4
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Common Core Grade 5, List 4
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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:
For decades, quantum mechanics has relied on complex numbers, which combine a real component with an imaginary component.
From Science Daily ● Jul. 13, 2026
Actors search for emotional truth in imaginary lives.
From Los Angeles Times ● Jul. 13, 2026
In the corner, Lionel Messi was moving almost in slow motion, his arms methodically swinging against an imaginary tide.
From BBC ● Jun. 27, 2026
Sometimes the text will address a bird as “you,” as if to participate in an imaginary conversation.
From The Wall Street Journal ● Jun. 12, 2026
His regard for her was quite imaginary; and the possibility of her deserving her mother’s reproach prevented his feeling any regret.
From "Pride and Prejudice" by Jane Austen
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“We have to, as artists, find the courage to disrupt convention, practice the spreading of hope and cultivate new stories and imaginaries that challenge divisive binaries.”
From Seattle Times ● Oct. 24, 2023
“I love how he weaves in the African oceanic imaginaries, the long durée of African historical inter-relationships with the world, and with itself,” Owuor added.
From Los Angeles Times ● Oct. 18, 2021
These were found in the anharmonic ratio, a device leading to the liberation of synthetic geometry from metrical relations, and in involution, which yielded rigorous definitions of imaginaries.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various
Poncelet throughout his work makes continual use of the foregoing theories of imaginaries and infinity, and also of the before-mentioned theory of reciprocal polars.
From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" by Various
The theorem is here referred to partly on account of its bearing on the theory of imaginaries in geometry.
From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" by Various
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.