1. a cafeteria or dining hall, especially in a school, workplace, or military facility
2. a portable water bottle or flask, typically used by soldiers, hikers, or campers
3. a small container for carrying water or other liquids

Examples

• The students ate lunch in the school canteen.
• Workers gathered in the factory canteen during their break.
• The soldier filled his canteen with fresh water before the march.
• She packed a canteen for the hiking trip.
• The military canteen served hot meals to the troops.
• He clipped the metal canteen to his backpack.
• The company canteen offers healthy meal options.