## complex number

any number expressed as

*a*+*bi*, where*a*and*b*are real numbers and*i*is the imaginary unit, : if*b*is zero it is a real number, but if*b*is not zero it is an imaginary number## complex number

noun

Any number of the form

*a*+*bi,*where*a*and*b*are real numbers and*i*is an imaginary number whose square equals −1.## complex number

Noun

(*plural* complex numbers)

- (complex analysis) A number of the form
*a + bi*, where*a*and*b*are real numbers and*i*denotes the imaginary unit