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imaginary number

noun, Mathematics
Also called imaginary, pure imaginary number. a complex number having its real part equal to zero.
1905-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for imaginary number
  • Ten raised to an imaginary number can be negative, so the log of a negative number is imaginary.
  • The reference planes have been displaced in order to keep the forward transfer coefficient a purely imaginary number.
British Dictionary definitions for imaginary number

imaginary number

any complex number of the form ib, where i = √–1
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
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imaginary number in Science
imaginary number
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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