Definition of telethon noun from the Oxford Advanced Learner's Dictionary

 

telethon

 noun
noun
BrE BrE//ˈteləθɒn//
 
; NAmE NAmE//ˈteləθɑːn//
 
TV shows, Helping others
 
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a very long television show, broadcast to raise money for charity See related entries: TV shows, Helping others Wordfinderappeal, benefit, charity, collection, donation, fundraiser, handout, telethon, volunteer, welfare More Like ThisBlended or portmanteau wordsalcopop, breathalyser, bromance, brunch, chillax, chugger, docusoap, edutainment, greenwash, guesstimate, infomercial, mechatronics, metrosexual, mockney, motel, multiplex, pleather, podcast, robocall, simulcast, sitcom, smog, staycation, telethon, televangelist, workaholic See worksheet. Word Origin 1940s (originally US): from tele- ‘at a distance’ + -thon on the pattern of marathon.
See the Oxford Advanced American Dictionary entry: telethon