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Etymology and usage

Casino is of Italian origin; the root casa means a house. The term casino may mean a small country villa, summerhouse, or social club. During the 19th century, casino came to include other public buildings where pleasurable activities took place; such edifices were usually built on the grounds of a larger Italian villa or palazzo, and were used to host civic town functions, including dancing, gambling, music listening, and sports. Examples in Italy include Villa Farnese and Villa Giulia, and in the US the Newport Casino in Newport, Rhode Island. In modern-day Italian, a casino is a brothel (also called casa chiusa, literally "closed house"), a mess (confusing situation), or a noisy environment; a gaming house is spelt casinò, with an accent.

Not all casinos are used for gaming. The Catalina Casino, on Santa Catalina Island, California, has never been used for traditional games of chance, which were already outlawed in California by the time it was built. The Copenhagen Casino was a Danish theatre which also held public meetings during the 1848 Revolution, which made Denmark a constitutional monarchy.

In military and non-military usage, a casino (Spanish) or Kasino (German) is an officers' mess.