1. a room in a school, office building, or other institution where people eat lunch

Examples

• The students gathered in the lunchroom at noon.
• Our office lunchroom has tables and a microwave.
• She forgot her lunch money and couldn’t buy food in the lunchroom.
• The lunchroom was crowded during the lunch period.
• They installed new vending machines in the employee lunchroom.
• The school lunchroom serves hot meals every day.