imaginary number

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

Origin:
1905–10

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Collins
World English Dictionary
imaginary number
 
n
any complex number of the form ib, where i = √--1

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
imaginary number   (ĭ-māj'ə-něr'ē)  Pronunciation Key 
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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Example sentences
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.
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