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Definition of imaginary number noun from the Oxford Advanced Learner's Dictionary

imaginary number

noun
 
/ɪˌmædʒɪnəri ˈnʌmbə(r)/
 
/ɪˌmædʒɪneri ˈnʌmbər/
(mathematics)
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  1. a number expressed as the square root of a negative number, especially the square root of -1 compare complex number, real number
See imaginary number in the Oxford Advanced American DictionarySee imaginary number in the Oxford Learner's Dictionary of Academic English
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