Adjective
imaginary -
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"
fanciful ,
notional
Noun
imaginary -
(mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1
complex number ,
complex quantity ,
imaginary number
number an item of merchandise offered for sale; "she preferred the black nylon number" ; "this sweater is an all-wool number"
math ,
mathematics ,
maths a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
complex conjugate either of two complex numbers whose real parts are identical and whose imaginary parts differ only in sign
real number ,
real any rational or irrational number
pure imaginary number an imaginary number of the form a+bi where a is 0
