(biology) the field of science concerned with processes of communication and control (especially the comparison of these processes in biological and artificial systems)
a table game in which short cues are used to knock balls into holes that are guarded by wooden pegs; penalties are incurred if the pegs are knocked over
performance given by a traveling company of acrobats clowns and trained animals; "the children always love to go to the circus"
a frenetic disorganized (and often comic) disturbance suggestive of a large public entertainment; "it was so funny it was a circus"; "the whole occasion had a carnival atmosphere"
a genus of haws comprising the harriers
an arena consisting of an oval or circular area enclosed by tiers of seats and usually covered by a tent; "they used the elephants to help put up the circus"
(antiquity) an open-air stadium for chariot races and gladiatorial games
a travelling company of entertainers; including trained animals; "he ran away from home to join the circus"
old; no longer in use or valid or fashionable; "obsolete words"; "an obsolete locomotive"; "outdated equipment"; "superannuated laws"; "out-of-date ideas"