Source : Webster's Revised Unabridged Dictionary (1913)

Rival \Ri"val\, v. t. [imp. & p. p. {Rivaled}or {Rivalled}; p.
   pr. & vb. n. {Rivaling} or {Rivalling}.]
   1. To stand in competition with; to strive to gain some
      object in opposition to; as, to rival one in love.

   2. To strive to equal or exel; to emulate.

            To rival thunder in its rapid course. --Dryden.

Source : WordNet®

rival
     v 1: be equal to in quality or ability; "Nothing can rival cotton
          for durability"; "Your performance doesn't even touch
          that of your colleagues"; "Her persistence and ambition
          only matches that of her parents" [syn: {equal}, {touch},
           {match}]
     2: be the rival of, be in competition with; "we are rivaling
        for first place in the race"
     [also: {rivalling}, {rivalled}]

rival
     n : the contestant you hope to defeat; "he had respect for his
         rivals"; "he wanted to know what the competition was
         doing" [syn: {challenger}, {competitor}, {competition}, {contender}]
     [also: {rivalling}, {rivalled}]

rivalled
     See {rival}