| NOUN | phenomenon | long wave | a radio wave with a wavelength longer than a kilometer (a frequency below 300 kilohertz) |
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| Meaning | A radio wave with a wavelength longer than a kilometer (a frequency below 300 kilohertz). | |
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| Broader | radio wave, radio emission, radio radiation | An electromagnetic wave with a wavelength between 0.5 cm to 30,000 m |
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