The Collaborative International Dictionary of English v.0.48:

Consentaneous \Con`sen*ta"ne*ous\, a. [L. consentaneus.]
   Consistent; agreeable; suitable; accordant to; harmonious;
   concurrent.
   [1913 Webster]

         A good law and consentaneous to reason.  --Howell.
   -- Con`sen*ta"ne*ous*ly, adv. -- Con`sen*ta"ne*ous*ness,
   n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

consentaneous
    adj 1: in complete agreement; "a unanimous decision" [syn:
           consentaneous, consentient, unanimous]