noun, Mathematics.
Also called imaginary, pure imaginary number. a complex number having its real part equal to zero.
any complex number of the form ib, where i = √–1
imaginary number
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.


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