Definition of Money added

Competition between an individual player and an individual opponent, as opposed to team play such as scotch doubles and other multi-player variants.
A team play format in which an individual player from the home team plays a race against an individual player from the visiting team, and then is finished for that match. Several large leagues use this format, including APA/CPA and USAPL.

Either to hit the balls hard with no intention in mind other than to get lucky (or 'hit-and-hope'), or to shoot hard at the money ball ball with the same intention. Compare slop and fluke.

Same as foul

In snooker, the highest-value baulk colour, worth 4 points.

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.

A pocket; usually used in disgust when describing a scratch (e.g., "the cue ball's gone down the sewer").

When you have completed a shot by pocketing a ball into a pocket.

British term referring to the base or metaphorical "feet" of a ball that rattles in the jaws of a pocket before eventually dropping. Usually said of an object ball for which the intention was to pot it.

A predetermined number of games, usually played for a specified sum of money. Contrast race (a predetermined number of wins). Informally, sets may refer to gambling more generally, as in "I've been playing sets all day", even when the format is actually races or single games.

Nickname for the nine ball, usually only used when playing the game 9-Ball.

On two piece cues, the area of the cue between the joint and the wrap.

The World Professional Billiards and Snooker Association, founded in 1968 and based in Bristol, England, United Kingdom is the governing body of professional snooker and English billiards. It sets the sports' rules, organises tournaments and the pro-am and pro tours, and engages in various promotional activities.

Nine Ball is a rotation game so a player must hit the lowest numbered ball first.
The object of the game is pocket the 9-ball on any legal shot.

Failure to hit an object ball at all with the cue ball. In most sets of rules, this is a foul like any other. However, in some variants of bar pool a table scratch while shooting for the 8 ball is a loss of game where other more minor fouls might not be, as is scratching on the 8 ball (neither result in a loss of game in most professional rules).
By way of drift from the above definition, the term is also applied by many league players to the foul in more standardized rules of failing to drive a (any) ball to a cushion, or to pocket a legal object ball, after the cue ball's initial contact with an object ball.
By way of entirely different derivation ("scratch off the table"), it can also mean knocking the cue ball (or more loosely, any ball) completely off the table.

Also simply maximum. In snooker, the highest break attainable with the balls that are racked; usually 147 points starting by potting fifteen reds, in combination with blacks, and clearing the colours. Also called a 147 (one-four-seven). In six-red snooker, the maximum break is only 75 points, due to fewer red balls and thus fewer black-scoring opportunities.

Principally US: One or more sets, usually in the context of gambling. See also ahead race (a.k.a. ahead session) for a more specialized usage.
Principally British: Any of a group of pre-determined frames played in a match too long to be completed within a single day's play. A best of 19 frame match, for example, is generally played with two "sessions", the first composed of nine frames, the second of ten. This term is generally used only in the context of professional snooker, as matches at the amateur level are rarely played over more than nine frames. Longer matches can be split into three or four sessions.
In the APA and CPA Leagues, session refers to the season in which League play took place. There are three sessions in each League Year-Summer Session, Fall Session and Spring Session.

This is the imaginary line that a ball would need to follow in order for it to result in an effective bank shot.

Toward the head of the table. This is the playing area on the table above the middle pockets. The idea in an up table game is that shots are more difficult and further from the pockets in one pocket pool.

A shooter's body position and posture during a shot.

A British term for someone with little experience or understanding of the game, who may be skilled at potting individual balls but does not consider tactics such as position or safety; "he's a potter not a player." See also banger.

To intentionally rebound the cue ball off both of the pocket points to achieve position.

This shot is a minimally calculated distressed shot which makes it evident to the opponent you no longer have any hope to winning the game.

Same as cue.

Any mechanical aid that serves to extend the length of the player's cue, normally added to the end of the butt either by clipping around the end or screwing into the base. Though extensions are used for pool, it is more common in snooker because of the significantly larger table size.
In a tournament where players get limited time to make their shots (common in televised matches), an extension is extra time granted before making a shot; players have a limited number of extensions in each frame.