Baseball Glossary...

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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A Assist, Attendance
AB At-bat
AD Automatic double, sometimes called a Ground Rule Double.
Assist A throw or deflection of the ball from one player to another that either results in a putout or would have resulted in a putout if an error had not occurred.
At-bat An appearance by a player in the batter's box.  Appearances where the batter walks, sacrifices, is hit by a pitch, or is interfered with by the catcher do not count as official at-bats.
A two-base hit awarded by the umpire because a ball lands in fair territory and then bounces over the fence or into the stands.
Average A statistic which describes some facet of a player's performance.  Examples are batting average, slugging average, earned run average, and fielding average.  Refer to the statistics page for the proper formula to calculate these statistics.
AVG Average
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B Bunt
BA Batting average
Balk An illegal act by the pitcher with at least one runner on base.  All runners are entitled to advance one base.
Base on Balls An award of first base to a batter who has received four pitches outside the strike zone without swinging at them.  All forced runners advance one base.  Also called a "walk."
Batter-runner A term identifying the offensive player between the completion of the player's turn at bat and the end of the play where the player became a runner.
Batting Average The statistic obtained by dividing a player's number of hits by the player's number of official at-bats.  Refer to the statistics page for the proper formula to calculate this statistic.
BB Base on Balls
BF Batters Faced
BK Balk
BL Bats Left
BP Batting Practice
BS Blown Save
Bunt The act of tapping the ball gently into the infield with a loosely held bat.
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C Catcher
Catcher's Earned
Run Average
A team's total earned run average with a particular catcher.
Caught Stealing Tagged out while attempting to steal a base.
CERA Catcher's Earned Run Average
CF Center Field
CG Complete Game
Complete Game A statistic credited to a pitcher who pitches an entire game without relief.
A game that has not been postponed, called, or delayed in some other manner.
CS Caught Stealing
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D Defense, Double
Designated Hitter A hitter listed in the starting lineup who is assigned to hit for the starting pitcher and all relief pitchers in the game.
Disabled List A list of players who have been temporarily removed from the active roster so that they may recover from injury or illness.  Roster substitutions are allowed for players placed on the disabled list.
Double A hit which allows the batter reaches second base safely.
Double Play A play which results in two offensive players being put out, provided that no error is committed between putouts.
Doubleheader Two games played on the same day by the same two teams.
DP Double Play
DH Designate Hitter, Doubleheader
DL Disabled List
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E Error
Earned Run A run that is charged to the pitcher and is scored without the aid of an error, passed ball, obstruction, or catcher's interference.
Run Average
The average numbers of earned runs scored on a pitcher for a full nine-inning game.  Refer to the statistics page for the proper formula to calculate this statistic.
ER Earned Run
ERA Earned Run Average
Error A mistake made by the defensive team which aids the offensive team.
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F Fly, Flyout
FC Fielder's Choice
Fielder's Choice The act of defensive player who, after fielding a ground ball, attempts to put out a preceding player rather than the batter-runner.  The term may also be applied when a player manages to steal a base because of the indifference of the defensive team.
A statistic which represents a player's fielding ability.  Refer to the statistics page for the proper formula to calculate this statistic.
Fly, Fly Ball A ball that is hit into the air rather than on the ground.
Fly Out An out which results from a  fly ball being caught before it hits the ground.
FO Foul Out, Force Out
Force Out An out which resulted from the defensive player touching the base in a force play.
Force Play A play in which a baserunner must try to advance to the next base because a batter becomes a runner.
Foul Out An out caused by a fly ball being caught in foul territory.
Foul Territory The territory outside the area enclosed by the lines running from home plate to the left-field and right-field foul poles.
FP Fielding Percentage
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G Game
Game A contest between two teams which usually consists of 8 1/2 or 9 innings.
Games Finished The number of games finished by a relief pitcher.
Games Started The number of games started by a particular pitcher.
GDP/GIDP Ground into Double Play
GF Games Finished
Grand Slam A home run hit while base loaded.
GRD Ground Rule Double.
Rule Double
A two-base hit awarded by an umpire because the batter hit into a special situation defined in the ground rules.
GS Games Started, Grand Slam
GWRBI Game Winning Run Batted In
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H Hit, Hold
HB Hit Batter
HBP Hit by Pitch, Hit by Pitcher
Hit A ball batted into fair territory which allows the batter to reach base safely without the aid of an error.
Hit Batter A batter hit by a pitch.
Hit by
Struck by a pitched ball while within the batter's box.
Home Run A base hit where the batter is able to touch all three bases and return to home before being put out.
HP Hit by Pitch
HR Home Run
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I Interference
IF Infield, Infielder, Infield Fly
Infield The area on the playing field contained within the four baselines.
Infield Fly A fair fly ball, hit with less than two outs, which can be caught by an infielder without extraordinary effort, when first and second or first, second, and third bases are occupied.  Line drives and attempted bunts do not count.
Infield Fly Rule A rule which declares the batter out because, in the judgement of the umpire, a fair fly ball hit within the infield can be caught by an infielder facing the infield when at least first and second bases are occupied and there is less than two out.  For this purpose, an outfielder that is stationed in or near the infield is also considered an infielder.  The umpire signals that the rule is in effect by calling "infield fly" and raising a clenched fist overhead.  The ball does not have to be caught.  The batter is out but the ball is still live and all baserunners may try to advance at their own peril.  The rule was instituted so that an infielder does not deliberately drop the ball so that a double-play can be set up.
Infielder A fielder who occupies a position within the infield.
Inning A segment of the game where each team has one turn at-bat and one turn in the field.
Innings Pitched The number of innings within which a specific pitcher has pitched.  Every out is considered a third of an inning.
Intentional Walk A base on balls because the pitcher deliberately threw the fourth ball outside the strike zone.
Interference An act by a fielder which hinders a players attempt to hit a pitch or an act by a member of the team at bat that impedes a fielder attempting to make a play.
IP Innings Pitched
IW Intentional Walk
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Judgment Call A ruling by an umpire for a situation not specifically covered by the rules.
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K Strikeout
Strikeout, called
KC Strikeout, called
KS Strikeout, swinging
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L Line Drive, Loss, Losing Pitcher
Left on Base The number of runners on base at the time a third out in a half-inning is made.
LHB Left-handed Batter
LHP Left-handed Pitcher
Line Drive A batted ball that has a trajectory that closely parallels and then moves toward the ground.
LO Left On
LOB Left on Base
Losing Pitcher The pitcher who is responsible for giving up the run that allows the opposing team to win the game.
Loss A defeat.  The statistic credited to a losing pitcher.
LP Losing Pitcher
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NP Number of Pitches
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O Ovation
OBA On-Base Average
OBP On-Base Percentage
obs Obstruction
Obstruction The act of impeding a runner by a fielder that is not in possession of the ball.
OF Outfield, Outfielder
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. 
The percentage of batters that reach base against a specific.  Sometimes used to refer to "on-base percentage."
A statistic that represents a batter's ability to get on base.  See the statistics page for the formula.
OS Official Scorer
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PA Plate Appearance
Passed Ball A pitched ball that gets by the catcher and allows one or more runners to advance.  If it occurs on a third strike, the batter may attempt to get to first base.  The catcher is not charged with an error.  If there are no runners on base, the catcher cannot be charged with it.
PB Passed Ball
PH Pinch Hitter
Pitch The throw to the batter.
Plate Appearance A player's appearance in the batter's box.  It includes all appearances in the batter 's box, not just those which result in an official at-bats.
PO Putout
Putout The retirement of a batter or runner by a member of the defense.
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QS Quality Start
Quality Start The act of a pitcher throwing at least six innings and giving up three or fewer earned runs.
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R Run(s)
RBI Run(s) Batted In
RHB Right-Handed Batter
RHP Right-Handed Pitcher
Run A score made by a runner.
Run Batted In A run that is caused by a batter's action at the plate, unless the batter hits into a double-play.
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S Sacrifice, Successful Steal of a Base, Save
SA Slugging Average
sac Sacrifice
Sacrifice A sacrifice hit.
Sacrifice Bunt A hit in which a bunted ball results in one or more runners advancing and the batter being put out at first base.
Sacrifice Fly A fly ball which is caught to retire the batter-runner but allows another player to score.
Sacrifice Hit A hit which results in one or more runners advancing and the batter being put out at first base
Save The credit given to a relief pitcher who maintains the lead in a game and allows the pitcher 's team to win.
SB Stolen Base
Scorecard A chart on which the plays of a game are recorded so that the game's events may be recalled later.
Scorekeeper The official who keeps a record of the score of a game.  Do not confuse with Official Scorer.
SF Sacrifice Fly
SH Sacrifice Hit, Sacrifice Bunt
ShO Shutout
Shutout A game in which the losing team does not score a single run.
The statistic which illustrates a batter's ability to make extra-base hits. Refer to the statistics page for the formula.
SO Strikeout, Shutout
SP Starting Pitcher
SS Split Squad, Shortstop
Starting Pitcher The first pitcher for each team in a game.
Stolen Base A base that is gained by a runner while a pitcher is in motion and without aid from any action by the batter or any fielders.
Strikeout An out made by a batter who has been charged with three strikes.
Strikeout, Called A strikeout which occurs when a batter makes no attempt on the third strike.
Strikeout, Swinging A strikeout which occurs when a batter makes an attempt on the third strike and misses.
SV Save
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T Triple, Amount of time to play game
TA Total Average
TB Total Bases
TBF Total Batters Faced
TC Total Chances
TL Throws Left
Total Average The ratio of a player's number of bases to number of outs.  Refer to statistics page for the formula.
Total Bases A batter's total number of bases created by base hits.
Total Chances Total number of play opportunities for a fielder.  Calculated by adding putouts, assists, and errors.
TP Triple Play
TR Throws Right
Triple A base hit in which the batter reaches third base safely.
Triple Play A play where three players are retired as a result of continuous action, provided that no errors occur between putouts.
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U Unassisted Putout
Unassisted Putout A putout made by a fielder without an assist.
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W Walk, Win, Winning Pitcher
Walk An award of first base to a batter who has received four pitches outside the strike zone without swinging at them.  All forced runners advance one base.  The same as a "base on balls."
Win A victory.  A statistic credited to the winning pitcher.
Wild Card A team that has been given a play-off spot because it has the best record among the teams that have not won a division.
Wild Pitch A pitch that is delivered in such a manner that the catcher cannot catch it with ordinary effort.
Winning Pitcher The player on the winning team who was the pitcher when the winning run is scored.
WP Wild Pitch, Winning Pitcher
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x Symbol used in the standings to indicate a team that has clinched the division title.  Also used by a scorer to indicate something extraordinary.
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y Symbol used in the standings to indicate a team that has earned a playoff spot.  After all division titles are determined, it indicates the wild card team.
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z Symbol used in the standings to indicate a team that is mathematically eliminated.
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1 Pitcher
1B First Base, First Baseman, Single
2 Catcher
2B Second Base, Second Baseman, Double
3 First Baseman
3B Third Base, Third Baseman, Triple
4 Second Baseman
5 Third Baseman
6 Shortstop
7 Left Fielder
8 Center Fielder
9 Right Fielder
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