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radiothon

[rey-dee-oh-thon]
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noun
  1. an 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.
Compare telethon.

Origin of radiothon

1960–65, Americanism; radio + -thon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018