The term originally meant a small villa, summerhouse or pavilion built for pleasure, usually on the grounds of a larger Italian villa or palazzo. There are examples of such casinos at Villa Giulia and Villa Farnese. In modern Italian, this term designates a bordello (also called "casa chiusa", literally "closed house"), while the gambling house is spelled casinò with an accent.

During the 19th century, the term casino came to include other public buildings where pleasurable activities, including gambling and sports, took place. An example of this type of building is the Newport Casino in Newport, Rhode Island.

Not all casinos were used for gaming. The Copenhagen Casino was a theatre, known for the use made of its hall for mass public meetings during the 1848 Revolution which made Denmark a constitutional monarchy. Until 1937 it was a well-known Danish theatre.^[2] The Hanko Casino at Hanko, Finland - one of that town's most conspicuous landmarks - was never used for gambling. Rather, it was a banquet hall for the Russian nobility which frequented this spa resort in the late 1800s, and is presently a restaurant.