Source : Webster's Revised Unabridged Dictionary (1913)

War \War\, v. i. [imp. & p. p. {Warred}; p. pr. & vb. n.
   {Warring}.]
   1. To make war; to invade or attack a state or nation with
      force of arms; to carry on hostilities; to be in a state
      by violence.

            Rezin the king of Syria, and Pekah the son of
            Remaliah, king of Israel, went up toward Jerusalem
            to war against it.                    --Isa. vii. 1.

            Why should I war without the walls of Troy? --Shak.

            Our countrymen were warring on that day! --Byron.

   2. To contend; to strive violently; to fight. ``Lusts which
      war against the soul.'' --1 Pet. ii. 11.

Source : WordNet®

war
     n 1: the waging of armed conflict against an enemy; "thousands of
          people were killed in the war" [syn: {warfare}]
     2: a legal state created by a declaration of war and ended by
        official declaration during which the international rules
        of war apply; "war was declared in November but actual
        fighting did not begin until the following spring" [syn: {state
        of war}] [ant: {peace}]
     3: an active struggle between competing entities; "a price
        war"; "a war of wits"; "diplomatic warfare" [syn: {warfare}]
     4: a concerted campaign to end something that is injurious;
        "the war on poverty"; "the war against crime"
     [also: {warring}, {warred}]

warred
     See {war}

war
     v : make or wage war [ant: {make peace}]
     [also: {warring}, {warred}]