Definition of readathon in English:

readathon

(also read-a-thon, read-athon)

noun

US
  • A protracted period of reading. In later use also: (a trademark for) a fund-raising event in which participants (usually children) collect donations based on the amount of reading they complete in a specified period of time.

Origin

1930s; earliest use found in The Syracuse Herald. From read + -athon.

Pronunciation

readathon

/ˈriːdəθɒn/