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WordReference Random House Unabridged Dictionary of American English © 2024ra•di•o•thon (rā′dē ō thon′),USA pronunciation n. - Show Businessan on-the-air radio campaign, often lasting 24 hours or more, designed to raise money for a radio station, charity, the arts, etc., as from listeners phoning in and pledging specific donations, sometimes in exchange for gifts or premiums. Cf. telethon.
- radio + -thon 1960–65, American.
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