Knock-on may refer to: * Rugby terminology: **

Knock-on (rugby league) This list of rugby league terms is a general glossary of the terminology used in the sport of rugby league football. The sport has accrued a considerable amount of jargon to describe aspects of the game. Many terms originate from the Laws of the G ...

, error by the player in possession of the ball in rugby league football **

Knock-on (rugby union) Rugby union is a team sport played between two teams of fifteen players. This is a general glossary of the terminology used in the sport of rugby union. Where words in a sentence are also defined elsewhere in this article, they appear in italics. ...

, event where the ball is knocked forward in rugby union * Causality-related terms: **

Knock-on electron A delta ray is a secondary electron with enough energy to escape a significant distance away from the primary radiation beam and produce further ionization, and is sometimes used to describe any recoil particle caused by secondary ionization. The ...

Knock-on effect In the social sciences, unintended consequences (sometimes unanticipated consequences or unforeseen consequences) are outcomes of a purposeful action that are not intended or foreseen. The term was popularised in the twentieth century by Ameri ...

See also