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imaginary

[ih-maj-uh-ner-ee]
adjective
  1. existing only in the imagination or fancy; not real; fancied: an imaginary illness; the imaginary animals in the stories of Dr. Seuss.
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noun, plural im·ag·i·nar·ies.
  1. Mathematics. imaginary number.
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Origin of imaginary

1350–1400; Middle English < Latin imāginārius, equivalent to imāgin-, (stem of imāgō) image + -ārius -ary
Related formsim·ag·i·nar·i·ly, adverbim·ag·i·nar·i·ness, nounnon·im·ag·i·nar·i·ly, adverbnon·im·ag·i·nar·i·ly·ness, nounnon·im·ag·i·nar·i·ness, nounnon·im·ag·i·nar·y, adjectivepre·im·ag·i·nar·y, adjectiveun·im·ag·i·nar·y, adjective
Can be confusedimaginary imaginative

Synonyms

Antonyms

1. real.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for imaginarily

imaginary

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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Derived Formsimaginarily, adverbimaginariness, noun
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

Word Origin and History for imaginarily

imaginary

adj.

"not real," late 14c., ymaginaire, from imagine + -ary; or else from Late Latin imaginarius "seeming, fancied," from imaginari. Imaginary friend (one who does not exist) attested by 1789.

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Online Etymology Dictionary, © 2010 Douglas Harper