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imaginary part

noun

, Mathematics.
  1. the coefficient b in the complex number a + bi.


imaginary part

noun

  1. the coefficient b in a complex number a + 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
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Word History and Origins

Origin of imaginary part1

First recorded in 1925–30

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imaginary numberimaginary runner