wavelength · noun C /ˈweɪv.leŋθ/
be on the same wavelength
C2 If two people are on the same wavelength, they have the same way of thinking and it is easy for them to understand each other.
Dictionary example:
We chatted occasionally, but I never really felt we were on the same wavelength.
Learner example:
We were on the same wavelength and we therefore started our own research. (Certificate of Proficiency in English; C2; French)
