Definition of "teach-in" [teach-in]

• An extended session, as on a college or university campus, for lectures and discussions on an important, usually controversial issue. (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.

• "Outside the Manhattan federal courthouse Monday, Carpenter described how she closed her account with a teller while about 20 protesters held what they called a "teach-in" in the branch, describing their experiences with the bank."
• "The investigator noted Frye "has come to our attention" on a number of occasions, including involvement in a letter questioning Canada's complicity in the Vietnam conflict, and his role on the honourary board of an international educational forum, called a "teach-in," on China at the University of Toronto in 1966."
• "At this month's teach-in, LaTosha Brown, director of the Gulf Coast Fund for Community Renewal and Ecological Health in New Orleans, said "BP recently made $5.6 billion in profits after destroying our ecosystem.""