The term 'ballroom dancing' is derived from the word ball which in turn originates from the Latin word ballare which means 'to dance' (a ball-room being a large room specially designed for such dances). In times past, ballroom dancing was social dancing for the privileged, leaving folk dancing for the lower classes. These boundaries have become blurred. The definition of ballroom dance also depends on the era: balls have featured popular dances of the day such as the MinuetQuadrillePolonaisePolkaMazurka, and others, which are now considered to be historical dances.

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http://dancelessons.net/dancehistory/HistoryofBallroomDance.html

The term "ballroom dancing" originated from the Latin word ballare, meaning 'to dance'. The term ball-room have being a large room where this form of dancing occurred. Throughout early history, the privileged performed ballroom dancing at social gathering, while the lower classes were left with  folk dancing . Popular dances of the era included MinuetQuadrillePolonaisePolkaMazurka, and others were also included in the category of ballroom dancing. However, these dances are now considered to be  historical dances.