Definitions of circus:

• noun:   performance given by a traveling company of acrobats clowns and trained animals

  Example: "The children always love to go to the circus"

• noun:   a frenetic disorganized (and often comic) disturbance suggestive of a circus or carnival

  Example: "It was so funny it was a circus"

• noun:   a genus of haws comprising the harriers
• noun:   an arena consisting of an oval or circular area enclosed by tiers of seats and usually covered by a tent

  Example: "They used the elephants to help put up the circus"

• noun:   (antiquity) an open-air stadium for chariot races and gladiatorial games
• noun:   a travelling company of entertainers; including trained animals

  Example: "He ran away from home to join the circus"