
das Casino
casino
A public building or room where games of chance are played for money; a gambling house.
Am Wochenende haben wir im Casino unser Glück beim Roulette versucht.
At the weekend, we tried our luck at roulette in the casino.
casino
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casino
A public building or room where games of chance are played for money; a gambling house.
Am Wochenende haben wir im Casino unser Glück beim Roulette versucht.
At the weekend, we tried our luck at roulette in the casino.

canteen / dining hall
A dining hall for a specific group of people, especially for officers in the military or for employees in a large company.
Die Vorstandsmitglieder trafen sich zum Mittagessen im Casino der Firma.
The board members met for lunch in the company's dining hall.
You can easily recognize the meaning of 'Casino' from the context. If it is about gambling, money, roulette, or poker, it means a casino. If it is about lunch, employees, a company, or the military, it means a dining hall.
Er hat beim Pokern im Casino viel Geld gewonnen.
He won a lot of money playing poker in the casino.
As with many buildings, you use 'ins Casino' (accusative) for direction and 'im Casino' (dative) for location. This applies to both meanings of the word.
Wir gehen heute Abend schick angezogen ins Casino.
We're going to the casino tonight dressed up smartly.
When referring to the gambling house, typical expressions are 'sein Glück versuchen' (to try one's luck), 'Geld verspielen' (to gamble away money), or 'einen Croupier beobachten' (to watch a croupier).
Manche Leute verspielen im Casino ihr ganzes Vermögen.
Some people gamble away their entire fortune in the casino.
fair / mass
In a military context, Messe and Casino can both refer to dining rooms for particular groups. Messe is used for the shared dining room of a crew or unit; Casino refers specifically to the dining hall for officers. The exact term therefore depends on the group of people involved.

Nach dem Dienst essen die Offiziere gemeinsam im Casino.
After duty, the officers eat together in the officers' dining hall.
Nach dem Dienst isst die Schiffsbesatzung gemeinsam in der Messe.
After duty, the ship's crew eats together in the mess.