canteen (Noun) — Restaurant for people at an institution (factory, school, business, etc).
canteen (Noun) — A flask for carrying water; used by soldiers or travellers.
canteen (Noun) — Sells food and personal items to personnel at an institution, school or camp etc..
canteen (Noun) — A restaurant outside; often for soldiers or policemen.
canteen (Noun) — A recreation room in an institution.
canteen (Noun) — A box for storing cutlery.