a mathematical expression (a + bi) in which a and b are real numbers and i 2 = −1.
any number of the form a + ib, where a and b are real numbers and i = √–1 See number (sense 1)
complex number
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 + 5i.


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