intervention

(noun) the act of intervening (as to mediate a dispute, etc.). Synonyms: intercession. Example: "It occurs without human intervention."

(noun) a policy of intervening in the affairs of other countries. Synonyms: interference.

(noun) the act or fact of interposing one thing between or among others. Synonyms: interposition.

(noun) (law) a proceeding that permits a person to enter into a lawsuit already in progress; admission of person not an original party to the suit so that person can protect some right or interest that is allegedly affected by the proceedings. Example: "The purpose of intervention is to prevent unnecessary duplication of lawsuits."

(noun) care provided to improve a situation (especially medical procedures or applications that are intended to relieve illness or injury). Synonyms: treatment.