Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- suffix Used to form words meaning a greatly extended period of any activity, usually for the purpose of
fundraising
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
Back-formation from marathon.
Support

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Examples
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It seems as if every weekend you can participate in an "-athon" type fundraiser for a nonprofit organization.
Lisa M. Dietlin: Making a Difference: The World of Giving -- Running, Walking or Biking for Charity Lisa M. Dietlin 2011
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It seems as if every weekend you can participate in an "-athon" type fundraiser for a nonprofit organization.
Lisa M. Dietlin: Making a Difference: The World of Giving -- Running, Walking or Biking for Charity Lisa M. Dietlin 2011
skipvia commented on the word -athon
Probably the most misappropriated suffix in existence. I cringe when I see an event that ends with it--bikeathon, bookathon, wordathon...
Hey...wordathon...
October 11, 2007