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-athon

suffix
 
 
/-ə.θɒn/ US  /-θɑːn/

Definition

added to the end of words referring to an activity or event, especially one that has been organized to raise money for charity, to show that it continues for a long time: a 24-hour dance-athon a walkathonEvents and occurrencesAccidents and disastersLong periods of timeMorphology and parts of words
(Definition of -athon suffix from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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