Cafeteria
Dining Hall, Diner
noun
An eating hall is a big room in which you eat. What big rooms do you eat in? How about a cafeteria, a dining hall, or a diner?
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
お昼ごはん、食堂で食べない？
Do you want to eat lunch in the cafeteria?
私の家の近くには、食堂がいくつかあります。
There are several eateries near my house.
さっきトーフグ食堂に行ったんだけど、無名の歌手が無料のワンマンライブをしてたよ。
When I went to the Tofugu dining hall a while ago, there was free live music from some singer I didn't know.