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definitions

imaginary unit

noun Mathematics.

the complex number i.

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Nearby words

  1. imaginal,
  2. imaginary,
  3. imaginary axis,
  4. imaginary number,
  5. imaginary part,
  6. imagination,
  7. imaginative,
  8. imagine,
  9. imagineer,
  10. imagineering

Origin of imaginary unit

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019