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intervention (n.)

early 15c., intervencioun, "intercession, intercessory prayer," Late Latin interventionem (nominative interventio) "an interposing, a giving security," literally "a coming between," noun of action from past-participle stem of Latin intervenire "to come between, interrupt," from inter "between" (see inter-) + venire "to come" (from a suffixed form of PIE root *gwa- "to go, come"). Later "act of intervening" in any way; in 19c.-20c. often of international relations; by 1983 of interpersonal intrusions by friends or family meant to reform a life felt to be going wrong.

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Definitions of intervention

intervention (n.)
the act of intervening (as to mediate a dispute, etc.);
it occurs without human intervention
Synonyms: intercession
intervention (n.)
a policy of intervening in the affairs of other countries;
Synonyms: interference
intervention (n.)
the act or fact of interposing one thing between or among others;
Synonyms: interposition
intervention (n.)
(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;
the purpose of intervention is to prevent unnecessary duplication of lawsuits
intervention (n.)
care provided to improve a situation (especially medical procedures or applications that are intended to relieve illness or injury);
Synonyms: treatment
From wordnet.princeton.edu