WordReference Random House Unabridged Dictionary of American English © 2025
ra•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.