interference

The act or an instance of hindering, obstructing, or impeding.

Something that hinders, obstructs, or impedes.

Illegal obstruction or hindrance of an opposing player, such as hindrance of a receiver by a defender in football, hindrance of a fielder by a base runner in baseball, or checking a player not in possession of the puck in ice hockey.

The legal blocking of defensive tacklers to protect and make way for the ball carrier.

The variation of wave amplitude that occurs from the superposition of two or more waves.