imaginary unit

noun Mathematics.

the complex number i.

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Nearby words

imaginal, imaginary, imaginary axis, imaginary number, imaginary part, imaginary unit, imagination, imaginative, imagine, imagineer, imagineering

Origin of imaginary unit

First recorded in 1905–10

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019