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imaginary number

noun
🔊/ɪˌmædʒɪnəri ˈnʌmbə(r)/
🔊/ɪˌmædʒɪneri ˈnʌmbər/
(mathematics数学)
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  1. a number expressed as the square root of a negative number, especially the square root of -1 虚数compare complex number, real number