Ballroom n. : A room for balls or dancing.

Example:
How is Ballroom dancing judged when everyone is doing something different?

Taxonomy
dances, ballroom dance, timing, bars per minute, competitions, International Standard, ballroom, dancers, Waltz, American Smooth, ballroom dancing, International Latin, American Rhythm, competitors, proficiency levels, American Style, free encyclopedia, early 20th century.

Defination from the web:
Ballroom dance refers to a set of partner dances, which are enjoyed both socially and competitively around the globe. ... The term "ballroom dancing" is derived from the word ball, which in turn originates from the Latin word ballare which means "to dance" ...