WordReference Random House Unabridged Dictionary of American English © 2026
com′plex num′ber, 
  1. Mathematicsa mathematical expression (a + bi) in which a and b are real numbers and i2 = -1.
  • 1825–35

Collins Concise English Dictionary © HarperCollins Publishers::
complex number n
  1. any number of the form a + ib, where a and b are real numbers and i = √–1
    See number
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'complex number' also found in these entries (note: many are not synonyms or translations):
absolute value - amplitude - imaginary - imaginary number - modulus - number - quaternion - argument - cosine - de Moivre's theorem - Gaussian integer - imaginary part - imaginary unit - principal argument - pure imaginary number - real number - real part - root of unity - sine

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