WordReference Random House Unabridged Dictionary of American English © 2025
-athon,
- a suffix extracted from marathon, occurring as the final element in compounds which have the general sense "an event, as a sale or contest, drawn out to unusual length, often until a prearranged goal, as the contribution of a certain amount of money, is reached'':walkathon; readathon.Also, -a-thon, -thon.
'-athon' also found in these entries (note: many are not synonyms or translations):