Baseball Glossary
Learn the language of Baseball — answer-first definitions with real examples, beginner to pro.
80 terms
- Age vs Level (Scouting)IntermediateAge vs level is the practice of evaluating a player's performance relative to how old they are compared to the competition they are facing, since being young for a level is generally a positive sign and being old for a level tempers otherwise strong numbers.
- Arm AngleIntermediateArm angle is the vertical orientation of the throwing arm at release. This comes from over-the-top through three-quarter, sidearm, to submarine. This means and it shapes both the pitch plane and movement profile.
- Arm Slot (Fielding)IntermediateA fielder's arm slot is the arm angle at release when throwing. This means the natural slot that produces the most accurate and arm-safe throw for that player's anatomy.
- Backhand FieldIntermediateFielding a ground ball backhand means catching it with the back of the glove hand turned toward the ball. This involves reaching across the body rather than squaring up in front of it.
- Backspin (Batting)IntermediateBackspin in batting is the rotation imparted on a batted ball when contact is made slightly below its center. This means the same Magnus effect that keeps a well-struck fly ball or line drive carrying rather than diving.
- BalkIntermediateA balk is an illegal or deceptive motion by the pitcher. At the same time, runners are on base, immediately awarding every runner one base without a pitch needing to be thrown.
- Ball TransferIntermediateBall transfer is the exchange of the ball from the glove to the throwing hand. This means speed and consistency here is one of the biggest separators in infield and catcher efficiency.
- Barrel PathIntermediateBarrel path is the trajectory the barrel of the bat travels through the hitting zone. This means matching it to the pitch plane for as long as possible maximises the chance of hard contact.
- Baseball IQIntermediateBaseball IQ is a player's situational awareness and decision-making. This means knowing where to throw the ball, when to take an extra base, how to position defensively, and what the game situation calls for, separate from raw physical tools.
- Baserunning ReadIntermediateA baserunning read is the split-second decision a runner makes based on what the ball does after contact — whether to advance, hold, or retreat.
- Bat DragIntermediateBat drag is a sequencing fault where the hands fire toward the ball well ahead of the barrel. This leaves the barrel trailing behind and forcing it to catch up late. This means costing bat speed and forcing contact deep and off the sweet spot.
- Bat SpeedIntermediateBat speed is how fast the barrel is moving at contact, in mph. It contributes to exit velocity alongside bat path and where on the barrel you make contact.
- Blocking a Pitch (Catching)IntermediateBlocking is a catcher's technique for smothering a pitch in the dirt with the body and chest protector. Instead of trying to catch it with the glove, to keep the ball in front and prevent a passed ball.
- Carry (Throw)IntermediateCarry describes how well a throw holds its velocity and straight-line trajectory through the air without tailing, sinking, or losing steam. This means a throw that "carries" arrives true to the target.
- Casting (Batting)IntermediateCasting is a swing fault where the hands and barrel swing out away from the body in a wide arc instead of taking a direct path to the ball. This means it kills bat speed and limits coverage of the inside pitch.
- Ceiling vs Floor (Scouting)IntermediateCeiling is a player's realistic best-case outcome if everything develops well. Floor is the realistic worst-case outcome if development stalls. This means scouts weigh both together, not just the exciting one.
- Changeup (Pitching)IntermediateThe changeup is an off-speed pitch thrown with fastball arm speed but held deeper in the hand to reduce velocity by 8–15 mph, disrupting timing.
- Chase RateIntermediateChase rate is the percentage of pitches thrown outside the strike zone that a hitter swings at. This means a core plate-discipline metric where lower is almost always better.
- Check SwingIntermediateA check swing is a hitter starting the swing motion and then stopping the bat before it crosses the plane of contact, most often to hold off on a pitch recognized late as a ball. This means its legality by the rulebook comes down to whether the bat and wrists broke toward the ball.
- Circle Changeup GripIntermediateThe circle changeup grip forms a circle with the thumb and index finger against the side of the ball, letting the remaining three fingers do the work. This means a grip designed to reduce velocity without changing arm speed.
- Command vs. ControlIntermediateControl means throwing enough strikes to avoid walks; command means locating a pitch to a precise spot within the zone. A pitcher can have one without the other.
- Contact Point (Batting)IntermediateContact point is where in space, relative to the hitter's body and the plate, the bat meets the ball. This means it shifts predictably by pitch location. A contact point that doesn't shift with location is a common source of weak contact.
- CurveballIntermediateThe curveball is an off-speed breaking pitch with topspin that makes it arc downward, often sharply, as it crosses the plate.
- Defensive RangeIntermediateDefensive range is how much ground a fielder can cover and convert into outs — a combination of first step, speed, reads, and athleticism.
- Double Play PivotIntermediateThe double play pivot is the footwork a middle infielder uses at second base to receive a throw, redirect toward first base, and release a throw quickly. This means all. At the same time, avoiding contact with a sliding baserunner.
- Down-and-In Swing PathIntermediateA down-and-in swing path is a barrel that descends and cuts across toward the hitter's body through the zone, instead of staying on the pitch's plane. This means producing weak pull-side grounders and easy outs on the top hand.
- Drop Step (Outfield)IntermediateA drop step is an outfielder's first movement on a ball hit over their head or into a gap. This means a quick pivot of the back foot that opens the hips and puts the fielder on the most direct running angle, rather than a false first step forward.
- Dropping the Back ShoulderIntermediateDropping the back shoulder is a fault where the rear shoulder tilts down toward the ground during the swing, steepening the bat path and often the root mechanical cause behind an uppercut and pop-ups.
- Exit Velocity (EV)IntermediateExit velocity is how fast the ball comes off the bat, in mph. It is a ceiling metric — the harder you hit it, the farther it can go.
- Extension at ContactIntermediateExtension means the arms extend through and just beyond contact rather than collapsing into the body. This means at contact itself the rear arm usually keeps some bend, especially on inside pitches, with extension completing just after impact.
- First StepIntermediateFirst step is how quickly a fielder initiates movement toward a batted ball — often the largest separator between good and great defenders.
- First-Pitch Swing RateIntermediateFirst-pitch swing rate is the percentage of plate appearances in which a hitter swings at the very first pitch (the 0-0 count), used as a simple measure of a hitter's early-count aggressiveness.
- First-Step QuicknessIntermediateFirst-step quickness is how fast a fielder's first movement reacts to a batted ball off the bat. This means widely considered the single biggest determinant of defensive range, more important than straight-line sprint speed.
- Five-Tool PlayerIntermediateA five-tool player is a position player rated above-average or better in all five core scouting skills. This means hitting for average, hitting for power, running speed, arm strength, and fielding ability.
- Front Shoulder Flying OpenIntermediateThe front shoulder flying open is a fault where the lead shoulder rotates toward the pitcher too early, pulling the eyes and barrel off the ball before contact and causing weak, pulled contact or a swing-and-miss.
- Glove PresentationIntermediateGlove presentation (for catchers) is how the catcher holds and moves the mitt to receive the pitch cleanly and, in competitive baseball, to subtly show the umpire the ball in the strike zone.
- Ground Ball RateIntermediateGround ball rate (GB%) is the percentage of batted balls that are grounders. This means typically a negative indicator for power hitters, though contact hitters may use it strategically.
- Hand PathIntermediateHand path is the route the hands travel from launch position to contact. This means an efficient, direct path to the ball keeps the barrel in the zone longer and prevents casting.
- Head Movement (Batting)IntermediateHead movement is excess drift, bob, or tilt of the head during the swing. This means a moving visual reference point makes it harder to track the ball accurately and reliably find the barrel.
- Hip Rotation (Batting)IntermediateHip rotation in batting is the aggressive turning of the hips toward the pitcher to initiate the swing. This means the engine that drives rotational power before the hands or barrel move.
- Hit-and-RunIntermediateA hit-and-run is a play call in which a baserunner takes off toward the next base as the pitch is thrown. The hitter is required to swing and make contact. This means ideally putting the ball in play on the ground. This means to protect the runner.
- Hitch in the SwingIntermediateA hitch is an extra downward or backward dip of the hands after the load has already started forward, effectively creating a second, unplanned load that costs precious time against velocity.
- Jump (Stolen Base)IntermediateThe jump on a stolen base attempt is how quickly and decisively a runner breaks toward the next base on the pitcher's first movement. This means the single biggest predictor of stolen base success.
- Launch Angle (Batting)IntermediateLaunch angle in batting is the vertical angle the ball leaves the bat. Roughly 10–25° produces the hardest, most productive contact.
- Leg KickIntermediateA leg kick is a pronounced lift of the front knee during the load, used to build extra rhythm and stored energy before the stride and swing fire. This means a bigger, higher-risk trigger than a toe tap or no-stride approach.
- Line Drive RateIntermediateLine drive rate (LD%) is the percentage of batted balls classified as line drives (typically 0–25° launch angle with hard contact). This means the batted-ball type with the highest expected batting average.
- Long Toss ProgramIntermediateA long toss program is a structured throwing routine in which a player gradually increases throwing distance well beyond normal game distances, then works back down, used to build arm strength and as part of an overall arm-conditioning routine.
- No-Stride ApproachIntermediateA no-stride approach keeps the front foot planted throughout the load. This uses hand and hip movement alone to trigger the swing. This means trading a little rhythm and momentum for a simpler, more reliably on-time timing system.
- On-Base Plus Slugging (OPS)IntermediateOPS is a hitting statistic calculated by adding on-base percentage and slugging percentage together, combining a hitter's ability to reach base with their ability to hit for power into a single number.
- Opposite Field HittingIntermediateOpposite field hitting is driving the ball to the side of the field away from the hitter's dominant hand. This means it requires letting the pitch travel deeper before contact, and staying disciplined enough not to rush the swing to pull it instead.
- Pickoff MoveIntermediateA pickoff move is a pitcher's legal throw (or step) toward a base with a runner on, aimed at catching that runner off the bag before a pitch is thrown.
- Pitch MixIntermediateA pitcher's pitch mix is the combination and proportion of pitch types thrown. This means for example 55% fastball, 20% slider, 15% changeup, 10% curveball. This means and how that mix shifts by count and batter.
- Pitch RecognitionIntermediatePitch recognition is identifying a pitch's type and location early. This means out of the pitcher's hand and from spin. This means. As a result, the hitter can commit to a swing or take decision before it's too late to act.
- Plate DisciplineIntermediatePlate discipline is the ability to distinguish balls from strikes and to swing only at pitches where the hitter can do damage. This means the foundational mental skill of hitting.
- Player Development PlanIntermediateA player development plan is a written, individualized outline of a player's current skill level, specific priorities to work on. A timeline or checkpoints for reassessing progress, rather than an unstructured, generic practice routine.
- Productive OutIntermediateA productive out is an out that still accomplishes something for the team. This means advancing a runner, scoring a run, or moving a runner into scoring position. Instead of simply ending the at-bat with no benefit.
- Projectable FrameIntermediateA projectable frame is a young player's body type. This means typically tall and lean. This means that scouts believe has room to add strength and size as the player physically matures. This is expected to translate into added power, velocity, or bat speed later.
- Pull Side HittingIntermediatePull side hitting is driving the ball to the same side of the field as the hitter's dominant hand. This means the natural result of meeting the ball earlier in the swing. The direction that carries the most raw power for most hitters.
- Reading a HopIntermediateReading a hop is the skill of judging early where a ground ball's bounce will arrive. As a result, the fielder can set footwork and glove angle before the ball gets there rather than reacting once it has.
- Relay ThrowIntermediateA relay throw breaks one impossible outfield throw into two makeable ones. This means the outfielder hits an infielder who has run out to meet the ball. That fielder turns and delivers the second leg.
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