[noun] [C] - the distance between two waves of energy, or the length of the radio wave used by a particular radio station for broadcasting programmesI don't know which wavelength the station is on - is it on long wave?I can't seem to get on with him - we're just not on the same wavelength (= we think very differently and are not interested in the same things).
WAVELENGTH
Meaning of WAVELENGTH in English
Cambridge English vocab. Кембриджский английский словарь. 2012