Replacement

[Britney]

The removal of an edge or an angle by one or more
planes.

[Monty]

The [substitute]

[Ernesto]

The action or process of replacing someone or something.

[Jason Yan]

Replacement in Rugby League. Each team is allowed to have four substitutes or replacements, with whom they are allowed to replace four of their participating players. This takes place only with the referees permission, and when the ball is out of play.