telethon

telethon

[tel-uh-thon]
noun
a television broadcast lasting several hours, especially one soliciting support for a charity.

Origin:
1945–50; tele-1 + -thon

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World English Dictionary
telethon (ˈtɛləˌθɒn)
 
n
a lengthy television programme to raise charity funds, etc
 
[C20: from tele- + marathon]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

telethon
prolonged TV fundraiser, 1949, from tele(vision) + (mara)thon.
Online Etymology Dictionary, © 2010 Douglas Harper
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