1. (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1;

[syn: complex number, complex quantity, imaginary number,

1. not based on fact; unreal;

- Example: "the falsehood about some fanciful secret treaties"- F.D.Roosevelt

- Example: "a small child's imaginary friends"

- Example: "to create a notional world for oneself"

[syn: fanciful,

The Collaborative International Dictionary of English v.0.48:

Imaginary \Im*ag"i*na*ry\, 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]The Collaborative International Dictionary of English v.0.48:

Imaginary \Im*ag"i*na*ry\, n. (Alg.) An imaginary expression or quantity. [1913 Webster]WordNet (r) 3.0 (2006):

imaginary adj 1: not based on fact; unreal; "the falsehood about some fanciful secret treaties"- F.D.Roosevelt; "a small child's imaginary friends"; "to create a notional world for oneself" [syn: fanciful, imaginary, notional] n 1: (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1 [syn: complex number, complex quantity, imaginary number, imaginary]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