Conference Room, Council Room, Meeting Room
noun
A room where you meet for discussions is known as a conference room.
かいぎしつ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
会議室は三階にあります。
The conference room is located on the third floor.
この会議室にはプロジェクターとホワイトボードがあります。
This meeting room has a projector and whiteboard.
ビエトとコウイチが会議室に入ったまんまずっと出てこないんだ。
Viet and Koichi went in the meeting room and still haven't come out.