| A | B |
|---|
| single | A play in which the batter safely makes it to first base. |
| double | A play in which the batter makes it safely to second base without stopping. |
| triple | A play in which the batter makes it safely to third base without stopping. |
| Home Run | A play in which the batter makes it safely around all bases and back to home plate without stopping. |
| hit | When the batter hits and the ball and safely reaches base. |
| walk | When a pitcher throws a batter four balls. |
| balk | An illegal motion by the pitcher with one or more runners on base, entitling all runners to advance one base. |
| bottom | The second half of an inning. |
| top | The first half of an inning. |
| Hit by Pitch | When the pitcher throws the pitch and it hits the batter. |
| sacrifice | a ball hit when there are less than two outs that enables a base runner to advance and that results in the batter being put out; not counted as an official at bat. |
| sacrifice fly | a ball hit into the air and caught that allows a runner to score; not counted as an official at bat. |
| bunt | legally batted ball, not swung at but intentionally met with the bat and tapped within the infield. |
| fielder's choice | a statistic charged to a batter who reaches first base safely but causes an existing base runner to be forced out on the play. |
| one | pitcher |
| two | catcher |
| three | 1st base |
| four | 2nd base |
| five | 3rd base |
| six | shortstop |
| seven | left field |
| eight | center field |
| nine | right field |
| out | (of a batter or base runner) unsuccessful at getting on base or advancing a base |
| strike | a pitch counted against a batter that is the result of either the ball passing through the strike zone, the batter swinging and missing, the batter hitting an uncaught foul ball with less than two strikes, the batter hitting a foul bunt when there are two strikes, or a foul tip caught by the catcher. |
| strike zone | the area above home plate extending from the batter's knees to the midpoint between the top of the batter's uniform pants and the top of his shoulders |
| strike out | (of a batter) to receive three strikes and be called out |
| stolen base | a statistic credited to a base runner who successfully advances a base without being forced to run when the batter hits the ball. |
| caught stealing | a statistic charged to a base runner who is put out attempting to steal a base |
| hit and run | to attempt a play in which a runner on first base leaves for second base on a pitch, and the batter tries to hit the ball to the right side. |
| double play | To get two outs on a single play. |
| triple play | To get three outs on a single play. |
| intentional walk | the act of a pitcher purposely throwing four pitches for balls which allows the batter to be awarded first base; |
| scoring position | second and third base; based on the assumption that runners on these bases are likely to score on a base hit. |
| umpire | an official at a baseball game who is stationed on the playing field. |
| pennant | a symbol that represents winning the league championship. |
| run | the unit of scoring in a baseball game achieved when a runner safely touches all four bases. |
| RBI | Run Batted In |
| Run Batted In | a credit given to a batter when one or more runners score as a result of a base hit, a sacrifice or, when the bases are loaded, a base on balls, hit by pitch, or catcher's interference that forces in a run. |
| earned run | a run charged to a pitcher because a base runner who scores reached base on a hit or base on balls given up by the pitcher. |
| earned run average | a measure of how many runs a pitcher allows over a nine inning game, calculated as: (earned runs x 9) / innings pitched. |
| inning | one of the nine divisions of a baseball game in which each team is allowed to bat until they make three outs. |
| game | nine innings |
| extra innings | the innings played after nine because the score is tied. |
| wild pitch | a pitched ball that gets past a catcher and allows runners to advance, and which, in the opinion of the umpire, cannot be caught by the catcher. |
| passed ball | a pitch that gets past the catcher but which he is expected to catch. |
| error | a play that is incorrectly made by a defensive player and that allows a batter to reach first base, a runner to advance, or a batter to extend his time at bat. |
