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English definition of “wavelength”

wavelength

noun [C]     /ˈweɪv.leŋθ/
the distance between two waves of energy, or the length of the radio wave used by a particular radio station for broadcasting programmes: I don't know which wavelength the station is on - is it on long wave?Radio
(Definition of wavelength noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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