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

telethon

noun

/ˈteləθɒn/

/ˈteləθɑːn/

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a very long television show, broadcast to raise money for charityTopics TV, radio and newsc2, Social issuesc2
Word Origin1940s (originally US): from tele- ‘at a distance’ + -thon on the pattern of marathon.

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See telethon in the Oxford Advanced American Dictionary

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