Jisho

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きょすう 虚数
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Noun
1. imaginary number​Mathematics
Wikipedia definition
2. Imaginary number​An imaginary number is a number whose square is less than or equal to zero. For example, is an imaginary number and its square is −25. An imaginary number can be written as a real number multiplied by the imaginary unit i, which is defined by its property . An imaginary number bi can be added to a real number a to form a complex number of the form a + bi, where a and b are called, respectively, the real part and the imaginary part of the complex number.
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