Source : Webster's Revised Unabridged Dictionary (1913)

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.

   Syn: Emulation; competition. See {Emulation}.

Source : WordNet®

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