wave·length 
/ˈweɪvˌlɛŋkθ/ noun
plural wave·lengths /ˈweɪvˌlɛŋkθ/ noun [count] 1 technical : the distance from one wave of energy to another as it is traveling from one point to another point
▪ Light and sound have different wavelengths. ▪ radio wavelengths 2 informal — used especially in the phrases on the same wavelength and on a different wavelength to say that people share or do not share a way of thinking ▪ We are usually on the same wavelength. [=we usually agree, think the same way about things, etc.] ▪ She is on a different wavelength than I am.
▪ Light and sound have different wavelengths. ▪ radio wavelengths
