teach-in

UK: /ˈtiːtʃɪn/ US: (tēch′in′)

Inflections of 'teach-in' (n): npl: teach-ins

WordReference Random House Unabridged Dictionary of American English © 2025

teach-in  (tēch′in′), n., pl. teach-ins. 

1. a prolonged period of lectures, speeches, etc., conducted without interruption by members of the faculty and invited guests at a college or university as a technique of social protest.

• see -in³ 1960–65

Collins Concise English Dictionary © HarperCollins Publishers::

teach-in noun

1. an informal conference, esp on a topical subject, usually held at a university or college and involving a panel of visiting speakers, lecturers, students, etc