wavelength
noun [ C ]
uk/ˈweɪvleŋθ/ usthe distance between two waves of sound, light, etc., or the length of the radio wave used by a particular radio station for broadcasting programmes:
Light must be maintained at a certain wavelength to destroy bacteria.
on a different wavelength
thinking in a different way and not understanding each other well:
He and I seem to be operating on a different wavelength.
on the same wavelength
thinking in a similar way and understanding each other well:
Members of the team must be on the same wavelength.