intervention-n; 3 Senses

Sense Number 1: the activity of assisting a process or an individual

Commentary: INTERVENTION[+event][+activity][+assistance][+individual/+situation]

These are plants that grow naturally in this climate without human intervention.
Without medical intervention, the baby would have died from the illness.
She manages a center that does family crisis intervention, including drug and alcohol abuse.
The central banks practice currency intervention to provide price stability to major world currencies.
Economists don't predict further intervention by the Fed in terms of raising the interest rates this week.

WordNet 3.0 Sense Numbers: 1

Sense Number 2: a nation's imposition of policy on another nation

Commentary: INTERVENTION[+activity][+imposition][+official][+nation] a policy or act of a nation to impose policy or conditions on another nation
NOTE: a narrow, specific usage of Sense 1 - always refers to the actions of a state, not an individual.

'Let us decide our quarrels at home without the intervention of any foreign power.' (Sir W. Temple)
They have been critical of the administration's policy of intervention in the Middle East.
Pete believes that earlier military intervention against Hitler might have prevented World War II.

WordNet 3.0 Sense Numbers: 2

Sense Number 3: legal right to enter an ongoing lawsuit

Commentary: INTERVENTION[+state][+legal][+condition][+inclusion][+lawsuit][+ongoing]
NOTE: technical, legal sense a proceeding that permits a person to enter into a lawsuit already in progress; so that person can protect some right or interest that is allegedly affected by the proceedings

Civil procedure in U.S. law recognizes two types of intervention; intervention of right and permissive intervention.
Permissive intervention is up to the discretion of the court.
The purpose of intervention is to prevent unnecessary duplication of lawsuits.

WordNet 3.0 Sense Numbers: 4