Etymology

intervene

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Today it means: To become involved in a situation, so as to alter or prevent an action. Full definition →

Latin interveniō
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The story

  1. Latin · derived frominterveniō“come between”
  2. English todayintervene

Back-formation from intervention, and/or from Latin interveniō (“come between”, verb).

Etymology from Wiktionary, CC BY-SA 4.0.