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/ˈweɪvlɛŋ(k)θ/ · noun
(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
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
Use wavelength when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Wavelength means (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..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
I'd take requests on the telephone / I'm on a wavelength far from home
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