# Imaginary-number meaning

A complex number in which the imaginary part is not zero.

noun

A complex number in the form

*a*+*bi*where*b*is not zero: when*a*is zero, it is a pure imaginary number.noun

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 4*i*and 2 − 3*i*, but not 3 + 0*i*(which is just 3).(complex analysis) A number of the form

*ai*, where*a*is a real number and*i*the imaginary unit.noun

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