intervention

noun4

1. •
   The action of intervening; interfering in some course of events.
2. •
   An orchestrated attempt to convince somebody with an addiction or other psychological problem to seek professional help and/or change their behavior.
3. •
   An action taken or procedure performed; an operation.
4. •
   (US) A 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.