/ Dictionary / Index W wave number: Meaning and Definition of Find definitions for: wave' num"ber Pronunciation: [key] the number of waves in one centimeter of light in a given wavelength; the reciprocal of the wavelength. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. wavemeter wave-off Related Content Daily Word Quiz: supercilious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language