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Synonyms
i·mag·i·nar·y (ĭ-măj́ə-nĕŕē)

adjective 

  1. Having existence only in the imagination; unreal.
  2. Mathematics
    1. Of or being the coefficient of the imaginary unit in a complex number.
    2. Of, involving, or being an imaginary number.
    3. Involving only a complex number of which the real part is zero.

noun: pl., -ies. 

Mathematics
An imaginary number.

derivatives

i·maǵi·naŕi·ly
adverb
i·maǵi·naŕi·ness
noun