[1] : The Collaborative International Dictionary of English v.0.48

imaginary \imag"inary\, a. l. imaginarius: cf. f.
   imaginaire.
   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;
        illusive.
        1913 webster
see also:
imaginary calculus calculus imaginary expression imaginary quantity imaginary points lines 
surfaces 

[2] : The Collaborative International Dictionary of English v.0.48

imaginary \imag"inary\, n. alg.
   an imaginary expression or quantity.
   1913 webster

[3] : WordNet (r) 2.0

imaginary
     adj : not based on fact; dubious; "the falsehood about some
           fanciful secret treaties"- f.d.roosevelt; "a small
           child's imaginary friends"; "her imagined fame"; "to
           create a notional world for oneself" syn: fanciful,
           imagined, notional
see also:
fanciful imagined notional 

[4] : Moby Thesaurus II by Grady Ward, 1.0

123 moby thesaurus words for "imaginary":
   barmecidal, barmecide, abstract, air-built, airy, algorismic,
   algorithmic, aliquot, apparent, apparitional, autistic, cardinal,
   chimeric, chimerical, cloud-built, deceptive, decimal, delusional,
   delusionary, delusive, delusory, dereistic, differential, digital,
   dreamlike, dreamy, erroneous, ethereal, even, exponential,
   fallacious, false, fancied, fanciful, fantastic, fatuitous,
   fatuous, fictional, fictitious, fictive, figmental, figural,
   figurate, figurative, finite, fractional, gaseous, gossamery,
   hallucinatory, hypothetical, ideal, illusional, illusionary,
   illusive, illusory, imaginational, imaginative, imagined,
   immaterial, impair, impossible, infinite, integral, irrational,
   legendary, logarithmic, logometric, made-up, merely nominal,
   misleading, mythic, mythical, mythological, negative, nonexistent,
   not real, notional, numeral, numerary, numerative, numeric, odd,
   ordinal, ostensible, pair, phantasmagoric, phantasmal, phantasmic,
   phantom, phantomlike, positive, possible, prime, quixotic, radical,
   rarefied, rational, real, reciprocal, seeming, self-deceptive,
   self-deluding, shadowy, specious, spectral, spirituous,
   submultiple, subtile, subtle, supposititious, surd, tenuous,
   transcendental, unactual, unfounded, unreal, unrealistic,
   unsubstantial, untrue, vaporous, visional, visionary, windy

Imaginary >> I Words
Imaginary, definition of term: Imaginary
imaginary_pag1.html

Imaginary Part >> I Words
Imaginary Part, definition of term: Imaginary Part
imaginary+part_pag1.html

Imaginary Numbe >> I Words
Imaginary Numbe, definition of term: Imaginary Numbe
imaginary+numbe_pag1.html