The Collaborative International Dictionary of English v.0.48:

Comradeship \Com"rade*ship\, n.
   The state of being a comrade; intimate fellowship.
   [1913 Webster]

WordNet (r) 3.0 (2006):

comradeship
    n 1: the quality of affording easy familiarity and sociability
         [syn: chumminess, camaraderie, comradeliness,
         comradery, comradeship]