a complex number of the form iy where y is a real number and i =  . |
| Also called imaginary, pure imaginary number. a complex number having its real part equal to zero. |
imaginary number  (ĭ-māj'ə-něr'ē) Pronunciation Key
A type of complex number in which the multiple of i (the square root of -1) is not equal to zero. Examples of imaginary numbers include 4i and 2 - 3i, but not 3 + 0i (which is just 3). See more at complex number. |