Definition of "call-in" [call-in]

• Being in a format such that listeners or viewers are invited to have their telephone conversations with the host or guests on a show broadcast to other listeners: a call-in radio show. (adjective)
• A viewer's or listener's telephone conversation with or telephone call to the host of such a show. (noun)
• A viewer or listener making such a call. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "It's what Dr. Laura would say if she had a call-in show devoted to academic economists."
• "But before, when I was in Kansas, I would listen to Christian call-in stations because it was all I could get on the radio."
• "Sheen's media blitz Monday also included a 40-minute interview from his backyard with celebrity website TMZ, a call-in to Fox Sports Radio's Loose Cannons program and a surprise stop at CNN's Piers Morgan Tonight, on which Sheen said he's on a quest to claim absolute victory across the board on every front in this whole mess."