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1 definition found
 for Imaginary quantity
From The Collaborative International Dictionary of English v.0.48 :

  Imaginary \Im*ag"i*na*ry\, a. [L. imaginarius: cf. F.
     Existing only in imagination or fancy; not real; fancied;
     visionary; ideal.
     [1913 Webster]
           Wilt thou add to all the griefs I suffer
           Imaginary ills and fancied tortures?     --Addison.
     [1913 Webster]
     Imaginary calculus See under Calculus.
     Imaginary expression or Imaginary quantity (Alg.), an
        algebraic expression which involves the impossible
        operation of taking the square root of a negative
        quantity; as, [root]-9, a + b [root]-1.
     Imaginary points, lines, surfaces, etc. (Geom.),
        points, lines, surfaces, etc., imagined to exist, although
        by reason of certain changes of a figure they have in fact
        ceased to have a real existence.
     Syn: Ideal; fanciful; chimerical; visionary; fancied; unreal;
          [1913 Webster]

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