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plural wavelengths
(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. quotations examples
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
(figurative) A person's attitude and way of thinking as compared to another person's. examples