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- Off the ball
- an incident that occurred away from the main contest. Note that off the ball is not the direct opposite of on the ball.
- On the ball
- a player who is not in any set position but who follows the ball all over the ground; also known as a follower or onballer, and not the direct opposite of off the ball.
- One-percenter
- a defensive act such as a block, bump, shepherd, smother or chase; "one-percenters" very rarely show up in any typical statistical analysis of a game, but are generally highly-valued by coaches, supporters and spectators alike.
- Out on the full
- a kick that travels across the boundary line without first being touched by a player or hitting the ground. This will result in a free kick to the opposition team, taken by the player closest to the point at which the ball crossed the boundary line.
- Outside midfielder
- a midfielder who receives most of his possessions in an uncontested manner, and often gets to position to receive handpasses from inside midfielders.
- Oval
- the ground on which an Australian Rules Football game is played. Derived from the common shape of the ground.
- Over the mark
- a player from either team who crosses from his side of the mark when there is a free kick being taken is said to have gone over the mark. If the attacking player does this, he is called to play on; if the defending player does this, he is penalised with a fifty metre penalty.
Read more about this topic: Glossary Of Australian Rules Football