imaginary number


noun Mathematics.

Also called imaginary, pure imaginary number. a complex number having its real part equal to zero.

Nearby words

  1. imagesetter,
  2. imaginable,
  3. imaginal,
  4. imaginary,
  5. imaginary axis,
  6. imaginary part,
  7. imaginary unit,
  8. imagination,
  9. imaginative,
  10. imagine

Origin of imaginary number

First recorded in 1905–10

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


British Dictionary definitions for imaginary number

imaginary number

noun

any complex number of the form i b, 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

Science definitions for imaginary number

imaginary number

[ĭ-măjə-nĕr′ē]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.