Definitions

1. noun

A long period of television broadcast, especially a charitable appeal on television.

“The charity held a telethon to raise money for disaster relief efforts.”

2. noun

A similar long period of broadcast on radio or other media.

“The radio station hosted a telethon to raise funds for a local food bank.”

3. noun

A charity event that lasts for a long time, typically broadcast on television or radio.

“The charity telethon ran for 24 hours to raise as much money as possible.”