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(uncountable) Organized, large-scale, armed conflict between countries or between national, ethnic, or other sizeable groups, usually but not always involving active engagement of military forces.
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(countable) A particular conflict of this kind.
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(countable, sometimes proscribed) Protracted armed conflict against irregular forces, particularly groups considered terrorists.
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(countable, by extension) Any protracted conflict, particularly
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(obsolete, uncountable) An assembly of weapons; instruments of war.
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(obsolete) Armed forces.
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(uncountable, card games) Any of a family of card games where all cards are dealt at the beginning of play and players attempt to capture them all, typically involving no skill and only serving to kill time.