the act or fact of intervening.
interposition or interference of one state in the affairs of another.

1375–1425; late Middle English < Late Latin interventiōn- (stem of interventiō) a coming between. See intervene, -tion

interventional, interventionary, adjective
prointervention, adjective
reintervention, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
intervention (ˌɪntəˈvɛnʃən)
1.  the act of intervening
2.  any interference in the affairs of others, esp by one state in the affairs of another
3.  economics the action of a central bank in supporting the international value of a currency by buying large quantities of the currency to keep the price up
4.  commerce the action of the EU in buying up surplus produce when the market price drops to a certain value

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

early 15c., from L.L. interventionem (nom. interventio) "an interposing," noun of action from pp. stem of L. intervenire "to come between, interrupt," from inter- "between" + venire "come" (see venue).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

intervention in·ter·ven·tion (ĭn'tər-věn'shən)
Interference so as to modify a process or situation.

in'ter·vene' (ĭn'tər-vēn') v.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The intervention of performers introduces a complication of economic conditions
  which is in itself likely to be injurious.
There is a chance that this intervention may not be necessary.
Although the name has more to do with marketing than divine intervention,
  so-called miracle fruit is pretty neat anyway.
Intervention will result in only disturbing the natural balances and the
  consequences will be unknown.
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