WordReference Random House Unabridged Dictionary of American English © 2026
wave′ num′ber, 
  1. Physicsthe number of waves in one centimeter of light in a given wavelength;
    the reciprocal of the wavelength.
  • 1900–05

Collins Concise English Dictionary © HarperCollins Publishers::
wave number n
  1. the reciprocal of the wavelength of a wave
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