| NOUN | phenomenon | sky wave | a radio wave that is reflected back to earth by the ionosphere or a communications satellite |
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| Meaning | A radio wave that is reflected back to earth by the ionosphere or a communications satellite; permits transmission around the curve of the earth's surface. | |
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| Narrower | ionospheric wave | A sky wave that is reflected by the ionosphere |
| 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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