1.NounThe action of intervening; interfering in some course of events.
2.NounA legal motion through which a person or entity who has not been named as a party to a case seeks to have the court order that they be made a party.
3.NounAn orchestrated attempt to convince somebody with an addiction or other psychological problem to seek professional help and/or change their behavior.
4.NounAn action taken or procedure performed; an operation.