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imaginary number

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imaginary number

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

Origin:
1905–10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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imaginary number  
n.  A complex number in which the imaginary part is not zero.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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