Definition of wavelength noun from the Oxford Advanced Learner's Dictionary
1 the distance between two similar points on a wave of energy, such as light or sound2 the size of a radio wave that is used by a particular radio station, etc. for sending signals or broadcasting programmes
ˈweɪvleŋθ ; ˈweɪvleŋθ
be on the same wavelength|
be on somebody's wavelength (informal) to have the same way of thinking or the same ideas or feelings as somebody elseWe work together but we aren't really on the same wavelength.