imaginary part

noun Mathematics.
the coefficient b in the complex number a + bi.
Compare real part.

1925–30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
imaginary part
the coefficient b in a complex number a + ib, where i = √--1

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
In a lot of science, we'd discard the imaginary part, but here maybe that can't be done.
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