See baseball statistics for more formal definitions of some of the statistical concepts in this glossary.
This is an alphabetical list of selected unofficial and specialized terms, phrases, and other jargon used in baseball, along with their definitions, including illustrative examples for many entries.
0–9[edit]
0[edit]
"Oh and ..." See .
1[edit]
- Official scorekeepers assign a number from 1 to 9 to each position on the field in order to record the outcome of each play in their own shorthand. The number 1 corresponds to the pitcher.
- A shout of "One!" indicates the ball should be thrown to first base.
- A "one-bagger" is a single.
- In the context of pitching, the number 1 is a common sign [and nickname] for the fastball.
1-2-3 inning[edit]
An inning in which a pitcher faces only three batters and none safely reaches a base. "Three up, three down."
1-2-3 double play[edit]
A double play in which the pitcher [1] fields a batted ball and throws home to the catcher [2], who retires a runner advancing from third. The catcher then throws to the first baseman [3] to force out the batter. These almost always happen with the .
1-6-3 double play[edit]
The pitcher [1] fields a batted ball and throws to the shortstop [6] to force out a runner advancing to second. The shortstop then throws to the first baseman [3] to force out the batter.
2[edit]
- The catcher, in scorekeeping shorthand.
- A shout of "Two!" indicates the ball should be thrown to second base.
- A "two-bagger" is a double.
- In the context of pitching, the number 2 is a common sign [and nickname] for a curveball.
2–2–2 [2 balls, 2 strikes, 2 outs][edit]
See .
20–80 scale[edit]
A number scale used by MLB scouts to assign grades to players, especially prospects. A 20 is the lowest possible grade, 50 is considered major league average, and 80 is the highest possible grade. The scale is used to assign an overall grade to players but also is used to assess specific skill sets such as contact hitting, power hitting, and basepath speed, among others. For pitchers, the scale is used to assess the quality of their specific pitches, such as their fastball or curveball.
3[edit]
- The first baseman, in scorekeeping shorthand.
- A shout of "Three!" indicates the ball should be thrown to third base.
- A "three-bagger" is a triple.
- In the context of pitching, the number 3 is a common sign [and nickname] for a slider.
3-2-3 double play[edit]
The first baseman [3] fields a batted ball and throws to the catcher [2], who retires a runner advancing from third and then throws back to the first baseman to force out the batter. These almost always happen with the .
3-6 double play[edit]
The first baseman [3] fields a batted ball, steps on first [to force the batter out], and then throws to the shortstop [6], who tags out a runner. Another possibility is a line drive caught by the first baseman, who throws to the shortstop, who then steps on second base for a second out.
3-6-1 double play[edit]
The first baseman [3] fields a batted ball and throws to the shortstop [6] to force out a runner at second. The shortstop then throws to the pitcher [1] [who is now covering first because the first baseman was busy fielding the ball] to force out the batter.
3-4-3 double play[edit]
The first baseman [3] fields a batted ball and throws to the second baseman [4] to force out a runner at second. The second baseman then throws back to the first baseman to force out the batter.
3-6-3 double play[edit]
The first baseman [3] fields a batted ball and throws to the shortstop [6] to force out a runner at second. The shortstop then throws back to the first baseman to force out the batter.
4[edit]
- The second baseman, in scorekeeping shorthand.
- A shout of "Four!" indicates the ball should be thrown to home plate.
- A "four-bagger" a home run.
- In the context of pitching, the number 4 is a common sign [and nickname] for a change-up.
4-6-3 double play[edit]
The second baseman [4] fields a batted ball and throws to the shortstop [6], who forces out a runner at second and then throws to the first baseman [3] to force out the batter.
45-foot line[edit]
- The line between home plate and first base that begins 45 feet down the first base line and extends past first base. The rules state that if the batter-runner is in the path of a throw that originates near home plate and is outside the area created by the base line and the 45-foot line, he shall be called out if the umpire believes he interfered with the play. If he remains within the line, he cannot be called out for interference. This rule is designed to allow catchers and pitchers the ability to field bunts and throw the batter-runner out without having to worry about the batter-runner intentionally or unintentionally interfering with the throw.
- This line is also used to decide whether a pickoff move is legal or a balk. If the pitcher steps with his lead foot towards the base he intends to throw to it is considered legal; the 45-foot line determines whether that step is towards the base or towards home plate. This only comes into play when the pickoff move is to the base the pitcher naturally faces, i.e. third for a right-hander or first for a lefty.
4 wide ones[edit]
Four consecutive pitches deliberately wide of the strike zone. Preacher Roe summarized this strategy to Stan Musial as "I throw him four wide ones and try to pick him off at first."
5[edit]
The third baseman, in scorekeeping shorthand.
5 hole[edit]
- Between a player's legs [the catcher's in particular]. From the hockey term for how a puck is advanced past the goalie ["through the five hole"].
5.5 hole[edit]
The space between the third baseman [5] and shortstop [6]. Made famous by perennial batting champion Tony Gwynn of the San Diego Padres as his description of where he liked to hit the baseball.
5-4-3 double play[edit]
The third baseman [5] fields a batted ball and throws to the second baseman [4] to force out a runner advancing from first. The second baseman then throws to the first baseman [3] to force out the batter.
5-4-3 triple play[edit]
The third baseman [5] fields a batted ball and steps on third base to force out a runner advancing from second, then throws to the second baseman [4] to force out a runner advancing from first. The second baseman then throws to the first baseman [3] to force out the batter.
5-tool player[edit]
A position player [non-pitcher] like Willie Mays, Andre Dawson, Duke Snider, Vladimir Guerrero or Ken Griffey Jr., who excels at:
- hitting for average
- hitting for power
- base running
- throwing
- fielding
6[edit]
The shortstop, in scorekeeping shorthand.
6-4-3 double play[edit]
The shortstop [6] fields a batted ball and throws to the second baseman [4], who forces out a runner advancing from first and then throws to the first baseman [3] to force out the batter.
7[edit]
The leftfielder, in scorekeeping shorthand.
7-2, 8-2, or 9-2 double play[edit]
A fly ball is caught by an outfielder, and a runner tries to tag up and score from third but is tagged out by the catcher.
8[edit]
The centerfielder, in scorekeeping shorthand.
9[edit]
The rightfielder, in scorekeeping shorthand.
9 to 0[edit]
The official score of a forfeited game in Major League Baseball.
12–6[edit]
A type of curveball, the motion of which evokes the hands of a clock.
30-30 club[edit]
Players who hit 30 home runs and steal 30 bases in a single season.
40-40 club[edit]
Players who hit 40 home runs and steal 40 bases in a single season.
[edit]
A pejorative term for a pitch that bounces short of the 60+1⁄2 feet between the pitching and .
90 feet[edit]
When a runner advances one base, he "moves up 90 feet"—the distance between successive bases. A runner on third base is "90 feet away" from scoring.
A[edit]
A-Ball or Class A[edit]
As of the 2022 season, "Class A" is the lowest grouping of modern affiliated minor league baseball, with sub-categories of "High-A" and "Single-A". "Short-Season A" leagues also existed before 2021. High-A is divided into three leagues: Midwest League, Northwest League, and South Atlantic League. Single-A is also divided into three leagues: California League, Carolina League, and Florida State League.
AA[edit]
- "Double-A" [AA] is the second-highest level of minor league baseball [below AAA], and as of 2022 includes the Eastern League, the Southern League, and the Texas League.
- "AA" is also the abbreviation for the American Association, which has been the name of numerous professional baseball leagues: a short-lived major league of the 19th century, a minor league for much of the 20th century, and an independent minor league that became a "Partner League" of Major League Baseball in 2021.
AAA[edit]
"Triple-A" is the highest level of minor league baseball. As of 2022, this level includes the International League and the Pacific Coast League.
AAAA player[edit]
"Four-A player" [alternatively, "Quadruple-A player"] is a term for a minor-league player who is consistently successful in the high minor leagues [AAA], but cannot translate that into success at the major-league level. Poor management can be responsible. "AAAA" may also informally refer to high-quality but unaffiliated foreign baseball leagues outside North America where play is considered less competitive than in MLB but more competitive than in AAA; this is usually restricted to describing Japan's NPB.
aboard[edit]
When a runner is . When there are runners safely on base, there are "runners aboard".
ace[edit]
The best starting pitcher on the team, who is usually first on a pitching rotation.
advance a runner[edit]
To move a runner ahead safely to another base, often the conscious strategy of a team that plays . If a batter does make an out, his will have been less negative if he still got a runner into ; in certain situations, batters even deliberately themselves.
ahead in the count[edit]
- A term that signifies whether the batter or pitcher possesses the advantage in an at-bat. If a pitcher has thrown more strikes than balls to a batter in an at-bat, the pitcher is ahead in the count; conversely, if the pitcher has thrown more balls than strikes, the batter is ahead.
- If the pitcher is ahead in the count, the batter is in increasing danger of striking out. If the batter is ahead, the pitcher is in increasing danger of walking him.
aim the ball[edit]
Sometimes when a pitcher tries a bit too carefully to control the location of a pitch, he is said to "aim the ball" instead of throwing it. This is a different meaning of "aim" from the situation in which a pitcher aims a pitch at a batter in an effort to hit him.
airmail[edit]
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