from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A joint host, as of a social event.
- transitive v. To serve as a joint host of: "In 1980, [he] co-hosted another event for large contributors” ( New Yorker).
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A joint host alongside another (compare costar).
- v. To act as a joint host.
- v. To store data on a shared server (as in web hosting).
Sorry, no etymologies found.