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Pronunciation varies by accent · noun
(radio) An electromagnetic wave refracted back to the Earth by the ionosphere..
Use sky wave when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Sky wave means (radio) An electromagnetic wave refracted back to the Earth by the ionosphere..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use sky wave where its definition matches the intended context.
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