■ noun ( plural ~es )
1》 a travelling company of acrobats, clowns, and other entertainers which gives performances typically in a large tent.
2》 (in ancient Rome) a circular or oval sporting arena lined with tiers of seats.
3》 informal a scene of lively activity.
4》 Brit. a circular open space in a town where several streets converge: Piccadilly Circus.
Origin
ME: from L., 'ring or ~'.