wavelength

Etymology

wave + length

noun

1. (physics) 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 1983, Wall of Voodoo (lyrics and music), “Mexican Radio”, in Call of the West
2. (figurative) A person's attitude and way of thinking as compared to another person's.
   I think you and I are on a different wavelength.