Meaning of -athon

-athon

Pronunciation: [key]
  1. a suffix extracted fromoccurring 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.