-athon Meaning in the Cambridge English Dictionary
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Meaning of “-athon” in the English Dictionary

"-athon" in British English

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-athonsuffix

uk   /-ə.θɒn/  us   /-θɑːn/
added to the end of words referring to an ​activity or ​event, ​especially one that has been ​organized to ​raisemoney for charity, to show that it ​continues for a ​longtime: a 24-hour dance-athon a walkathon
(Definition of -athon from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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