The Collaborative International Dictionary of English v.0.48:

Competitive \Com*pet"i*tive\, a.
   Of or pertaining to competition; producing competition;
   competitory; as, a competitive examination.
   [1913 Webster]

WordNet (r) 3.0 (2006):

competitive
    adj 1: involving competition or competitiveness; "competitive
           games"; "to improve one's competitive position" [syn:
           competitive, competitory] [ant: noncompetitive]
    2: subscribing to capitalistic competition [syn: competitive,
       free-enterprise(a), private-enterprise(a)]
    3: showing a fighting disposition; "highly competitive sales
       representative"; "militant in fighting for better wages for
       workers"; "his self-assertive and ubiquitous energy" [syn:
       competitive, militant]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "competitive":
   adversary, adversative, adverse, alien, antagonistic, anti,
   antipathetic, antithetic, clashing, competing, con, conflicting,
   contradictory, contrary, counter, cross, cutthroat, disaccordant,
   dissentient, emulous, enemy, fractious, hostile, in competition,
   in rivalry, inimical, negative, noncooperative, obstinate,
   opponent, opposed, opposing, opposite, oppositional, oppositive,
   oppugnant, overthwart, perverse, recalcitrant, refractory,
   repugnant, rival, rivaling, uncooperative, unfavorable, unfriendly,
   unpropitious, vying