noun
A room in a university or similar institution where lectures are held.
講義室は三階にあります。
The lecture hall is on the third floor.
この講義室は二百人収容できます。
This lecture room can accommodate two hundred people.
講堂 is an auditorium or large hall for lectures and ceremonies, typically larger than a 講義室.
Compound of 講義 (lecture) and 室 (room).