imaginary

American  

[ih-maj-uh-ner-ee] / ɪˈmædʒ əˌnɛr i /

adjective

1. existing only in the imagination or fancy; not real; fancied.

   an imaginary illness; the imaginary animals in the stories of Dr. Seuss.

   Synonyms:

   illusory, baseless, chimerical, shadowy, visionary, fanciful

   Antonyms:

   real

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noun

plural

imaginaries

1. Mathematics. imaginary number.

imaginary British  

/ -dʒɪnrɪ, ɪˈmædʒɪnərɪ /

adjective

1. existing in the imagination; unreal; illusory

2. maths involving or containing imaginary numbers. The imaginary part of a complex number, z, is usually written Im z

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Other Word Forms

• imaginarily adverb
• imaginariness noun
• nonimaginarily adverb
• nonimaginarilyness noun
• nonimaginariness noun
• nonimaginary adjective
• preimaginary adjective
• unimaginary adjective

Etymology

Origin of imaginary

1350–1400; Middle English < Latin imāginārius, equivalent to imāgin-, (stem of imāgō ) image + -ārius -ary

Example Sentences

Growing up in rural Canada, he turned his treehouse into an imaginary spaceship after seeing a photograph of Buzz Aldrin standing on the lunar surface.

From BBC • Mar. 30, 2026

Joseph weaves together an imaginary “Transatlantic Biennial” and W.E.B.

From Los Angeles Times • Mar. 4, 2026

"I tell my children imaginary stories. I try to make the stories motivating and uplifting," she said, such as tales of a new home with separate rooms and beds.

From Barron's • Mar. 3, 2026

Pilots log hundreds of hours chasing imaginary cars, bikes, and skiers through digital landscapes to practice—so that when the whole world is watching, they can reach their own rarefied plane of athletic zen.

From The Wall Street Journal • Feb. 13, 2026

He stood, feet apart, swaying with the imaginary movement of the deck, and lifted the sextant.

From "Carry On, Mr. Bowditch" by Jean Lee Latham

Related Words

• abstract
• fanciful
• fantastic
• fictional
• hypothetical
• imagined
• theoretical
• unreal
• whimsical