wavelength
wave·length [wavelength wavelengths] BrE [ˈweɪvleŋθ] NAmE [ˈweɪvleŋθ] noun 
1. the distance between two similar points on a wave of energy, such as light or sound
2. the size of a radio wave that is used by a particular radio station, etc. for sending signals or broadcasting programmes
Idioms: ↑on somebody's wavelength ▪ ↑on the same wavelength
Example Bank:
•My boss and I are just not on the same wavelength.
•Radio One has broadcast on this wavelength for years.
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