wavelength

noun

1. The length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next; it is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.

   “I'd take requests on the telephone / I'm on a wavelength far from home”

2. (figuratively)A person's attitude and way of thinking as compared to another person's.

   “I think you and I are on a different wavelength.”

   “And just when you mean to tell her / That you have no love to give her / Then she gets you on her wavelength / And she lets the river answer”