# Complex-number meaning

Any number of the form

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

Any number expressed as

*a*+*bi*, where*a*and*b*are real numbers and*i*is the imaginary unit, −1: if*b*is zero the expression is a real number, but if*b*is not zero the expression is an imaginary number.noun

A number that can be expressed in terms of

*i*(the square root of −1). Mathematically, such a number can be written*a*+*bi,*where*a*and*b*are real numbers. An example is 4 + 5*i.*(complex analysis) A number of the form

*a + bi*, where*a*and*b*are real numbers and*i*denotes the imaginary unit.noun

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