verb (used without object), intervened, intervening.
to come between disputing people, groups, etc.; intercede; mediate.
to occur or be between two things.
to occur or happen between other events or periods: Nothing important intervened between the meetings.
(of things) to occur incidentally so as to modify or hinder: We enjoyed the picnic until a thunderstorm intervened.
to interfere with force or a threat of force: to intervene in the affairs of another country.
Law. to interpose and become a party to a suit pending between other parties.

1580–90; < Latin intervenīre to come between, equivalent to inter- inter- + venīre to come; see convene

reintervene, verb (used without object), reintervened, reintervening.
unintervening, adjective

1. arbitrate, interpose. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
intervene (ˌɪntəˈviːn)
vb (foll by in or between)
1.  (often foll by in) to take a decisive or intrusive role (in) in order to modify or determine events or their outcome
2.  to come or be (among or between)
3.  (of a period of time) to occur between events or points in time
4.  (of an event) to disturb or hinder a course of action
5.  economics to take action to affect the market forces of an economy, esp to maintain the stability of a currency
6.  law to interpose and become a party to a legal action between others, esp in order to protect one's interests
[C16: from Latin intervenīre to come between, from inter- + venīre to come]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, from L. intervenire, from inter "between" + venire "to come" (see venue).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If possible, senior colleagues should intervene in such disputes.
He also prefers to revisit stale arguments rather than intervene in current
Genetic modification can help that if hysterical politics don't intervene.
Society was not there to intervene as a consequence they are paying to support
  them for the rest of their lives.
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