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imaginary number

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noun Mathematics.
  1. Also called imaginary, pure imaginary number. a complex number having its real part equal to zero.
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Origin of imaginary number

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for imaginary number

imaginary number

noun
  1. any complex number of the form i b, where i = √–1
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

imaginary number in Science

imaginary number

[ĭ-măjə-nĕr′ē]
  1. A type of complex number in which the multiple of i (the square root of -1) is not equal to zero. Examples of imaginary numbers include 4i and 2 - 3i, but not 3 + 0i (which is just 3). See more at complex number.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.