0 an organized event in which people walk a long distance in order to raise money for charity (= organizations that give money, food, or help free to those who are in need, or that provide money for causes such as medical research):
We are looking for walkers and sponsors for the annual walkathon in February.
Who hasn't given £10 to someone doing a breast cancer walkathon?
Usually when you support a special charity event, such as a walkathon or a benefit dinner, much of your donation is erased by overhead costs.
The Dallas Help the Homeless Walkathon opens at 3 p.m. at Dallas City Hall Plaza.
