WordNet (r) 3.0 (2006):

team spirit
    n 1: the spirit of a group that makes the members want the group
         to succeed [syn: esprit de corps, morale, team
         spirit]

Moby Thesaurus II by Grady Ward, 1.0:

98 Moby Thesaurus words for "team spirit":
   accord, accordance, affinity, agape, agreement, amity,
   bipartisanship, bonds of harmony, brotherly love, caritas,
   cement of friendship, charity, coaction, coadjuvancy,
   coadministration, coagency, cochairmanship, codirectorship,
   collaboration, collaborativeness, collectivism, collusion,
   commensalism, common effort, common enterprise, communalism,
   communion, communism, communitarianism, community,
   community of interests, compatibility, complicity, concert,
   concord, concordance, concurrence, congeniality, cooperation,
   cooperativeness, correspondence, duet, duumvirate, ecumenicalism,
   ecumenicism, ecumenism, empathy, esprit, esprit de corps,
   feeling of identity, fellow feeling, fellowship, frictionlessness,
   good vibes, good vibrations, happy family, harmony, identity,
   joining of forces, joint effort, joint operation, kinship,
   like-mindedness, love, mass action, morale, mutual assistance,
   mutualism, mutuality, octet, oneness, peace, pooling,
   pooling of resources, pulling together, quartet, quintet, rapport,
   rapprochement, reciprocity, septet, sextet, sharing, solidarity,
   symbiosis, sympathy, symphony, synergism, synergy, teamwork, trio,
   triumvirate, troika, understanding, union, unison, united action,
   unity