What is the meaning of Canteen?

A small cafeteria or snack bar, especially one in a military establishment, school, or place of work.

A cafeteria in a school or place of work.

Goods purchased from a prison canteen.

A temporary or mobile café used in an emergency or on a film location etc.

A box with compartments for storing eating utensils, silverware etc.

A military mess kit.

A water bottle, flask, or other vessel, typically used by a soldier or camper as a bottle for carrying water or liquor for drink.

inflection of cantear:

1. third-person plural present subjunctive
2. third-person plural imperative

third-person plural present subjunctive

third-person plural imperative

Source: wiktionary.org