Pronunciation: (kôl'in"), [key] Radio and Television.
1. a program in which listeners or viewers phone in comments or questions to the host or a person being interviewed.
2. a live telephone conversation intended for broadcasting between a program's host and a person being interviewed.
of, pertaining to, or featuring such phone calls or conversations: a call-in program.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.