The Collaborative International Dictionary of English v.0.48:

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[aum]kta, Dan. fegte, and perh. to E. fist; cf. L. pugnare
   to fight, pugnus fist.]
   1. To strive or contened 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.
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            You do fight against your country's foes. --Shak.
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            To fight with thee no man of arms will deign.
                                                  --Milton.
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   2. To act in opposition to anything; to struggle against; to
      contend; to strive; to make resistance.
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   To fight shy, to avoid meeting fairly or at close quarters;
      to keep out of reach.
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The Collaborative International Dictionary of English v.0.48:

Fight \Fight\, v. t.
   1. To carry on, or wage, as a conflict, or battle; to win or
      gain by struggle, as one's way; to sustain by fighting, as
      a cause.
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            He had to fight his way through the world.
                                                  --Macaulay.
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            I have fought a good fight.           --2 Tim. iv.
                                                  7.
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   2. To contend with in battle; to war against; as, they fought
      the enemy in two pitched battles; the sloop fought the
      frigate for three hours.
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   3. To cause to fight; to manage or maneuver in a fight; as,
      to fight cocks; to fight one's ship.
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   To fight it out, to fight until a decisive and conclusive
      result is reached.
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The Collaborative International Dictionary of English v.0.48:

Fight \Fight\, n. [OE. fight, feht, AS. feoht. See Fight, v.
   i.]
   1. A battle; an engagement; a contest in arms; a combat; a
      violent conflict or struggle for victory, between
      individuals or between armies, ships, or navies, etc.
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            Who now defies thee thrice to single fight.
                                                  --Milton.
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   2. A struggle or contest of any kind.
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   3. Strength or disposition for fighting; pugnacity; as, he
      has a great deal of fight in him. [Colloq.]
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   4. A screen for the combatants in ships. [Obs.]
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            Up with your fights, and your nettings prepare.
                                                  --Dryden.
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   Running fight, a fight in which the enemy is continually
      chased; also, one which continues without definite end or
      result.

   Syn: Combat; engagement; contest; struggle; encounter; fray;
        affray; action; conflict. See Battle.
        [1913 Webster]

WordNet (r) 3.0 (2006):

fight
    n 1: a hostile meeting of opposing military forces in the course
         of a war; "Grant won a decisive victory in the battle of
         Chickamauga"; "he lost his romantic ideas about war when he
         got into a real engagement" [syn: battle, conflict,
         fight, engagement]
    2: 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,
       fighting, combat, scrap]
    3: an aggressive willingness to compete; "the team was full of
       fight" [syn: competitiveness, fight]
    4: an intense verbal dispute; "a violent fight over the bill is
       expected in the Senate"
    5: a boxing or wrestling match; "the fight was on television
       last night"
    v 1: be engaged in a fight; carry on a fight; "the tribesmen
         fought each other"; "Siblings are always fighting";
         "Militant groups are contending for control of the country"
         [syn: contend, fight, struggle]
    2: fight against or resist strongly; "The senator said he would
       oppose the bill"; "Don't fight it!" [syn: fight, oppose,
       fight back, fight down, defend]
    3: make a strenuous or labored effort; "She struggled for years
       to survive without welfare"; "He fought for breath" [syn:
       fight, struggle]
    4: exert oneself continuously, vigorously, or obtrusively to
       gain an end or engage in a crusade for a certain cause or
       person; be an advocate for; "The liberal party pushed for
       reforms"; "She is crusading for women's rights"; "The Dean is
       pushing for his favorite candidate" [syn: crusade, fight,
       press, campaign, push, agitate]