Definition of interference

This is an instance when the person not taking their turn interferes with the game play, this is recorded as a foul.

24 Random Essential Billiards Terms

This refers to the distance of deflection that the ball comes off of the cue stick after a hit is applied with side spin on it.
Same as foot spot. Chiefly British today, but also an American usage ca. World War I.
An imaginary line drawn from the desired path an object ball is to be sent (usually the center of a pocket) and the center of the object ball.
Using knowledge of the game and one's own abilities and limitations to choose the manner of shooting and the particular shot from an array presented, that has a degree of likelihood of success. This often requires a player to forego a shot that if made would be very advantageous but does not have a high likelihood of success, in favor of a safety or less advantageous shot that is more realistically achievable.
Same as back spin.
A tournament format in which each contestant plays each of the other contestants at least once. In typical league team play, round robin format means that each member of the home team plays each member of the visiting team once. This format is used by BCAPL, VNEA and many other leagues.
A shot in which the cue ball is struck above its equator with sufficient top spin to cause the cue ball to travel forward after it contacts an object ball. When a cue ball with follow on it contacts an object ball squarely (a center-to-center hit), the cue ball travels directly forward through the space previously occupied by the object ball (and can sometimes even be used to pocket a second ball). By contrast, on a cut shot, a cue ball with follow on it will first travel on the tangent line after striking the object ball, and then arc forward, widening the carom angle.
This is when a player has scratched and the foul in one pocket calls for them to spot a ball, but not able to be spotted at the time. In this case a coin is usually placed on the side of the table to keep tabs.
An imaginary line dividing the table into two equal halves lengthwise. It intersects the head string, center string and foot string at the head spot, center spot and foot spot, respectively.
A form of doubles play in which the two team members take turns, playing alternating shots during an inning (i.e. each team's inning consists of two players' alternating visits, each of one shot only, until that team's inning ends, and the next team begins their alternating-shot turn.) Effective scotch doubles play requires close communication between team partners, especially as to desired cue ball position for the incoming player. Like "english", "scotch" is usually not capitalized in this context. The term is also used in bowling, and may have originated there.
Be in a game where either because of disparity in skill level, or because of a handicap given, it would be very difficult to lose.
When the contact between the cue ball and object ball is dead center.
This is a table that offers poor conditions for play; it is either dirty, wet, or overall poor quality.
A situation in which a ball strikes another ball which is close to a rail and the struck ball rebounds back into the ball it was hit by; usually but not always unintended.
This is to intentionally foul by slightly moving the ball, or playing another type of illegally defensive shot in a game where the ball is just turned over to the other player. Like in one pocket, you still take the foul, but can leave the other player with a challenging shot.
A (principally American) term in eight-ball for either of the set of seven balls (stripes or solids) that must be cleared before sinking the 8 ball. Borrowed from card games. Generally used in the generic, especially in rulesets or articles, rather than colloquially by players. See also group for the British equivalent.
The BCA Pool League is one of the major amateur pool leagues in the United States and is present in over a dozen other countries outside the U.S., with a significant presence in Canada
When an opponent either purposely successfully executes a defensive shot or misses their shot resulting in a bad leave for the next player.
Example: "I was left bad every time he missed his shot".
A ball that is easily made from many positions on the table but which is left untouched while the rack is played, so that in the event the player gets out of position, the shooter has an insurance shot. Typically an insurance ball will be in or near the jaws of a pocket.
These are fouls made in one turn and then on the next by the same player each time. Some games have a rule that a player will lose the rack or match with three succesive fouls.
Successive games won without the opponent getting to the table; a five-pack would be a package of five games.
A shot aimed so that the center of the cue ball is in line with the edge of the object ball, eclipsing half of the ball. "Hit it just a little thinner than half-ball." Assuming a cling does not occur, the shot will impart post-contact momentum on the object ball in a direction 30° (which is arcsin(1 - x), where x is the fraction of object ball eclipsed: ½ in this case) off the direction of the cue-ball's pre-contact momentum. Also notable because the carom angle the cue ball takes is more consistent than at other contact points.
Also smalls, small ones, small balls. In eight-ball, to be shooting the solid suit (group) of balls (1 through 7); "you're the small one" or "I've got the smalls". Compare little, solids, reds, low, spots, dots, unders; contrast big.
To win an inning that counters a good game your opponent just won.
The inning win that counters a good game your opponent just won.