Select the first letter of the word from the list above to jump to appropriate section of the glossary. If the term you are looking for starts with a digit or symbol, choose the '#' link.
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O Scorer's notation for out
OBA On-Base Average
OBP On-Base Percentage
obs Obstruction (see below)
Obstruction The act of impeding a runner by a fielder that is not in possession of the ball.
OBSTRUCTION is the act of a fielder who, while not in possession of the ball or not in the act of fielding the ball, impedes the progress of any runner. A fake tag is considered obstruction. (NOTE: If a fielder is about to receive a thrown ball and if the ball is in flight directly toward and near enough to the fielder so he/she must occupy his/her position to receive the ball, the fielder may be considered "in the act of fielding a ball." It is entirely up to the judgment of the umpire as to whether a fielder is in the act of fielding a ball. After a fielder has made an attempt to field a ball and missed, the fielder can no longer be in the "act of fielding" a ball. Example: If an infielder dives at a ground ball and the ball passes the fielder, and he/she continues to lie on the ground and delays the progress of the runner, the fielder has very likely obstructed the runner.)
OF Outfield, Outfielder
OFFENSE the team, or any player of the team, at bat.
OFFICIAL RULES. The rules contained within the Official Little League Rule Book.
Official Scorer The
person who is responsible for observing, recording, and ruling on the
plays in a game according to the official rules. The official
scorer must decide scoring issues, such as whether or not a batted
ball is a hit or an error.
See Rule 10.00 in "What's the Score" publication.
On-Base Average The percentage of batters that reach base against a specific. Sometimes used to refer to "on-base percentage."
On-Base Percentage A statistic that represents a batter's ability to get on base. See the statistics page for the formula.
ON DECK A term used to refer to the next batter up in the inning. This person stands in a designated circular area and warms up before batting.
On Deck Circle The marked area between home plate and the dugout where the on-deck batter warms up.
OS Official Scorer
OUT one of the three required retirements of an offensive team during its time at bat.
an instance of a batter or base runner being retired.
OUTFIELD Area between the back edge of the infield and home run fence.
OUTFIELDER a fielder who occupies a position in the outfield, which is the area of the playing field most distant from home base.
Out In Order Occurs when the pitcher retires the first three batters in an inning, thus ending the inning.
Outside Pitch a pitch thrown outside the strike zone away from the batter.
OVERSLIDE (or OVERSLIDING) is the act of an offensive player when the slide to a base, other than when advancing from home to first base, is with such momentum that the player loses contact with the base.
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