Usually means: Square root of negative one.
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We found 10 dictionaries that define the word imaginary unit:

General (7 matching dictionaries)
  1. imaginary unit: Merriam-Webster
  2. imaginary unit: American Heritage Dictionary of the English Language
  3. imaginary unit: Wiktionary
  4. imaginary unit: Infoplease Dictionary
  5. imaginary unit: Dictionary.com
  6. Imaginary unit: Wikipedia, the Free Encyclopedia
  7. imaginary unit: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. imaginary unit: Encyclopedia

Science (2 matching dictionaries)
  1. Imaginary Unit: Eric Weisstein's World of Mathematics
  2. imaginary unit: PlanetMath Encyclopedia

Definitions from Wiktionary (imaginary unit)

noun:  (number theory, complex analysis, quaternion theory) An imaginary number (in the case of complex numbers, usually denoted i) that is defined as a solution to the equation x²=-1.

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