1. (noun)circus a travellingcompany of entertainers; including trained animals "he ran away from home to join the circus"
2. (noun)circus a performancegiven by a travelingcompany of acrobats, clowns, and trained animals "the children always love to go to the circus"
3. (noun)circus, carnival a frenetic disorganized (and often comic) disturbance suggestive of a largepublicentertainment "it was so funny it was a circus"; "the whole occasion had a carnival atmosphere"
5. (noun)circus an arena consisting of an oval or circulararea enclosed by tiers of seats and usually covered by a tent "they used the elephants to help put up the circus"
6. (noun)Circus, genus Circus a genus of haws comprising the harriers