What is a century break in snooker?

A break of 100 points or more in a single visit to the table.

What is a clearance in snooker?

Potting every ball left on the table in one visit. A total clearance means from the first red to the last black.

The white going into a pocket after hitting another ball. It is a foul.

A shot where the white hits one object ball into another, which then goes into the pocket.

Snooker · Guide

The words commentators use, from a century to a kiss, in plain English.

Break: The total points scored in one visit to the table.
Century: A break of 100 or more.
Maximum: A 147: every red with the black, then all the colours. See the 147.
Clearance: Potting everything left on the table in one visit.
Frame ball: The ball that, once potted, puts the frame out of the opponent's reach.
Snookers required: When a player needs more points than are left. See snookers required.

Safety: A shot played to leave the opponent without a pot, rather than to score.
Snooker: Leaving the white where the opponent cannot hit the ball they must hit in a straight line.
Plant: The white hits one ball into another, which goes in.
Double: An object ball goes in off a cushion.
Cannon: The white hits one ball and then another, often used to split the reds.
Kiss: A light, often accidental, contact between two balls.
Screw: Backspin: the white comes back after hitting the object ball.
Stun: Hitting the white so it stops dead, or nearly, on contact.
Side: Sidespin, used to change the white's path off a cushion.
Swerve: Bending the white around another ball by striking down on it with side.
Break-off: The first shot of a frame, from the D into the reds.

In-off: The white goes into a pocket. A foul.
Miss: The referee rules a player did not try hard enough to hit the right ball. See fouls.
Free ball: After a foul leaves a player snookered, they can nominate any ball as the one they are on.
Push shot: Keeping the cue on the white as it strikes an object ball. A foul.
Re-spotted black: The tie-break when a frame ends level: the black goes back on its spot and the next score wins.

Rest: A stick with a cross-shaped head for shots the player cannot reach with their hand.
Spider and swan: Higher rests, for bridging over other balls.
Extension: A piece fitted to the end of the cue for long reaches.
Baulk: The end of the table behind the baulk line, where the D is.

What is a century break in snooker?: A break of 100 points or more in a single visit to the table.
What is a clearance in snooker?: Potting every ball left on the table in one visit. A total clearance means from the first red to the last black.
What does 'in-off' mean in snooker?: The white going into a pocket after hitting another ball. It is a foul.
What is a plant in snooker?: A shot where the white hits one object ball into another, which then goes into the pocket.