a variation of rugby played almost exclusively in Australia, engaging two teams of eighteen players each on an oval-shaped field about 180 yards (165 meters) long with four upright posts at each end, the object being to kick a rugby ball between these posts.
British Dictionary definitions for australian rules
(functioning as sing) a game resembling rugby football, played in Australia between teams of 18 men each on an oval pitch, with a ball resembling a large rugby ball. Players attempt to kick the ball between posts (without crossbars) at either end of the pitch, scoring six points for a goal (between the two main posts) and one point for a behind (between either of two outer posts and the main posts). They may punch or kick the ball and run with it provided that they bounce it every ten yards Also called national code