Definitions for "Complex number"
A number that has a real component and an imaginary component and is characterized as a point on a plane (instead of the real number line).
A number consisting of an ordered pair of real numbers, expressible in the form a+bi, where and are real numbers and squared equals -1.
A number of the form a + bi where a and b are real numbers and i is the square root of -1.
a convention created by mathemticians
Keywords:  see