Rivalry

from WordNet (r) 3.0 (2006)

rivalry
    n 1: the act of competing as for profit or a prize; "the teams
         were in fierce contention for first place" [syn:
         {competition}, {contention}, {rivalry}] [ant:
         {cooperation}]

from The Collaborative International Dictionary of English v.0.48

Rivalry \Ri"val*ry\, n.; pl. {Rivalries}.
   The act of rivaling, or the state of being a rival; a
   competition. "Keen contention and eager rivalries."
   --Jeffrey.
   [1913 Webster]

   Syn: Emulation; competition. See {Emulation}.
        [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

52 Moby Thesaurus words for "rivalry":
      antagonism, antipathy, bad blood, clashing, collision, competition,
      competitiveness, conflict, contention, contrariety, contrariness,
      controversy, covetousness, cross-purposes, cutthroat competition,
      disaccord, discord, dispute, dissension, emulation, enmity,
      enviousness, envy, feud, fractiousness, friction, gamesmanship,
      grudging, grudgingness, hostility, inimicalness, invidia,
      invidiousness, jealousy, jockeying, lifemanship, negativeness,
      noncooperation, obstinacy, one-upmanship, oppugnancy, perverseness,
      recalcitrance, refractoriness, repugnance, strife, striving,
      struggle, tug-of-war, uncooperativeness, vying, warfare