wavelength
wave.length \'wa-v-.len(k)th\ n : the distance in the line of advance of a wave from any one point to the next point at which at the same instant there is the same phase
Webster's English Dictionarywave.length \'wa-v-.len(k)th\ n : the distance in the line of advance of a wave from any one point to the next point at which at the same instant there is the same phase