imaginary

1. (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1 (synset 113751538)
   referred to in: math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
   is a type of: number - a concept of quantity involving zero and units
   subtypes:

   • complex conjugate - either of two complex numbers whose real parts are identical and whose imaginary parts differ only in sign
   • real, real number - any rational or irrational number
   • pure imaginary number - an imaginary number of the form a+bi where a is 0
   has: imaginary part, imaginary part of a complex number - the part of a complex number that has the square root of -1 as a factor
   same as: complex number, complex quantity, imaginary number

1. Not based on fact;
   Existing only in the imagination (synset 301943120)
   "the falsehood about some fanciful secret treaties"; "a small child's imaginary friends"; "to create a notional world for oneself"
   similar to: unreal - lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria
   same as: fanciful, notional

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