Source : Webster's Revised Unabridged Dictionary (1913)

Fight \Fight\ (f[imac]t), v. i. [imp. & p. p. {Fought}
   (f[add]t); p. pr. & vb. n. {Fighting}.] [OE. fihten, fehten,
   AS. feohtan; akin to D. vechten, OHG. fehtan, G. fechten, Sw.
   f["a]kta, Dan. fegte, and perh. to E. fist; cf. L. pugnare to
   fight, pugnus fist.]
   1. To strive or contend for victory, with armies or in single
      combat; to attempt to defeat, subdue, or destroy an enemy,
      either by blows or weapons; to contend in arms; --
      followed by with or against.

            You do fight against your country's foes. --Shak.

            To fight with thee no man of arms will deign.
                                                  --Milton.

   2. To act in opposition to anything; to struggle against; to
      contend; to strive; to make resistance.

   {To fight shy}, to avoid meeting fairly or at close quarters;
      to keep out of reach.

Fighting \Fight"ing\, a.
   1. Qualified for war; fit for battle.

            An host of fighting men.              --2 Chron.
                                                  xxvi. 11.

   2. Occupied in war; being the scene of a battle; as, a
      fighting field. --Pope.

   {A fighting chance}, one dependent upon the issue of a
      struggle. [Colloq.]

   {Fighting crab} (Zo["o]l.), the fiddler crab.

   {Fighting fish} (Zo["o]l.), a remarkably pugnacious East
      Indian fish ({Betta pugnax}), reared by the Siamese for
      spectacular fish fights.

Source : WordNet®

fighting
     n : the act of fighting; any contest or struggle; "a fight broke
         out at the hockey game"; "there was fighting in the
         streets"; "the unhappy couple got into a terrible scrap"
         [syn: {fight}, {combat}, {scrap}]

fighting
     adj 1: engaged in or ready for military or naval operations; "on
            active duty"; "the platoon is combat-ready"; "review
            the fighting forces" [syn: {active}, {combat-ready}, {fighting(a)}]
     2: engaged in war; "belligerent (or warring) nations"; "a
        fighting war" [syn: {belligerent}, {militant}, {war-ridden},
         {warring}]
     3: disposed to loud disagreements and fighting [syn: {brawling}]