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imaginary number
A number whose square is negative. Every imaginary number can be written in the form ib where b is a real number and i the imaginary unit with the property that i 2 = -1. Imaginary numbers are complex numbers in which the real part is zero. The term "imaginary" is unfortunate because it suggests something that has less reality than a "real" number, which isn't the case.
Related category
• MATHEMATICS
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