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Imaginary

a.
  1. Existing only in imagination or fancy; not real; fancied; visionary; ideal.
    2. 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, √-9, a + b √-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.

n.
  1. An imaginary expression or quantity.