noun

• (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.
  "holy war; just war; civil war"
• (countable) A particular conflict of this kind.
  "All human tribes glad token see In the close of the wars of Grant and Lee."
• (countable, sometimes proscribed) Protracted armed conflict against irregular forces, particularly groups considered terrorists.
  "Our war on terror begins with al Qaeda, but it does not end there. It will not end until every terrorist group of global reach has been found, stopped and defeated."
• (countable, by extension) Any protracted conflict, particularly
  "Trump’s lying is no less constant or blatant than in 2016, but by now it feels familiar, already priced in. What more is there to say about the “war on truth” a decade into Trump’s political career?"

verb

• (intransitive) To engage in conflict (may be followed by "with" to specify the foe).
  "...to war the Scot, and borders to defend..."
• (transitive) To carry on, as a contest; to wage.
  "[…], that thou by them mighteſt warre a good warfare,[…]."

name

• Preceded by the: designating a particularly notable war.
  "Through much of the War, Hitler carried his painter's kit, did water colors of War-ruined buildings."
• Preceded by the: designating a particularly notable war.

name

• (computing, Java programming language) Initialism of Web Application aRchive (a Java archive file).
• (military, historical) Initialism of Winchester Automatic Rifle.