The Collaborative International Dictionary of English v.0.48:

Consultative \Con*sult"a*tive\ (k[o^]n*s[u^]lt"[.a]*t[i^]v), a.
   Pertaining to consultation; having the privilege or right of
   conference. "A consultative . . . power." --Abp. Bramhall.
   [1913 Webster]

WordNet (r) 3.0 (2006):

consultative
    adj 1: giving advice; "an advisory memorandum", "his function
           was purely consultative" [syn: advisory,
           consultative, consultatory, consultive]