imaginary

The definition of imaginary is not real or existing only in the mind, or a square root of a negative number.

(adjective)

  1. An example of something imaginary is an invisible friend.
  2. An example of something imaginary is the square root of negative 16.

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See imaginary in Webster's New World College Dictionary

adjective

  1. existing only in the imagination; fanciful; unreal
  2. Math. designating or of the square root of a negative quantity, or of a complex number that is not real

Origin: L imaginarius

Related Forms:

See imaginary in American Heritage Dictionary 4

adjective
  1. Having existence only in the imagination; unreal.
  2. Mathematics
    a. Of or being the coefficient of the imaginary unit in a complex number.
    b. Of, involving, or being an imaginary number.
    c. Involving only a complex number of which the real part is zero.
noun pl. i·mag·i·nar·ies
Mathematics
An imaginary number.

Related Forms:

  • i·magˌi·narˈi·ly adverb
  • i·magˌi·narˈi·ness noun

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