Usually means: Square root of negative one.
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We found 20 dictionaries that define the word imaginary number:

General (12 matching dictionaries)
  1. imaginary number: Merriam-Webster
  2. imaginary number: American Heritage Dictionary of the English Language
  3. imaginary number: Collins English Dictionary
  4. imaginary number: Vocabulary.com
  5. imaginary number: Wiktionary
  6. imaginary number: Infoplease Dictionary
  7. imaginary number: Dictionary.com
  8. Imaginary Number, Imaginary number: Wikipedia, the Free Encyclopedia
  9. imaginary number: Rhymezone
  10. imaginary number: FreeDictionary.org
  11. imaginary number: Mnemonic Dictionary
  12. imaginary number: TheFreeDictionary.com

Business (1 matching dictionary)
  1. imaginary number: Legal dictionary

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

Medicine (1 matching dictionary)
  1. imaginary number: Medical dictionary

Science (3 matching dictionaries)
  1. Imaginary Number: Eric Weisstein's World of Mathematics
  2. The Computational Beauty of Nature (No longer online)
  3. imaginary number: PlanetMath Encyclopedia

Slang (1 matching dictionary)
  1. imaginary number: Urban Dictionary

Tech (1 matching dictionary)
  1. Rane Professional Audio Reference (No longer online)

(Note: See imaginary_numbers as well.)

Definitions from Wiktionary (imaginary number)

noun:  (complex analysis, strict sense) A number of the form bi, where b is any real number and i denotes the imaginary unit.
noun:  (complex analysis, broad sense) A number of the form a + bi, where a and b are real numbers and b is nonzero.

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