imaginary unit

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imaginary unit

n. Symbol i
The square root of -1, corresponding to the point (0,1) in the geometric representation of complex numbers as points in a plane.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

imag′inary u′nit


n.
the complex number
i.
[1905–10]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.