the process of military struggle between two nations or groups of nations; war.
armed conflict between two massed enemies, armies, or the like.
conflict, especially when vicious and unrelenting, between competitors, political rivals, etc.

1425–75; late Middle English werefare, i.e., a faring forth to war; see war1, fare

semiwarfare, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
warfare (ˈwɔːˌfɛə)
1.  the act, process, or an instance of waging war
2.  conflict, struggle, or strife

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1456, from war + fare (see fare (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In some situations, conflict over resources breaks out into warfare.
Warfare among human groups that still live by hunting and gathering resembles
  chimp warfare in several ways.
But even these are inexperienced in mountain warfare.
Twenty-third century warfare isn't all it's cracked up to be.
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