The Collaborative International Dictionary of English v.0.48:

Unanimous \U*nan"i*mous\ ([-u]*n[a^]n"[i^]*m[u^]s), a. [L.
   unanimus, unanimis; unus one + animus mind: cf. F. unanime.
   See Unit, and Animate.]
   1. Being of one mind; agreeing in opinion, design, or
      determination; consentient; not discordant or dissentient;
      harmonious; as, the assembly was unanimous; the members of
      the council were unanimous. "Both in one faith unanimous."
      --Milton.
      [1913 Webster]

   2. Formed with unanimity; indicating unanimity; having the
      agreement and consent of all; agreed upon without the
      opposition or contradiction of any; as, a unanimous
      opinion; a unanimous vote.
      [1913 Webster] -- U*nan"i*mous*ly, adv. --
      U*nan"i*mous*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

unanimous
    adj 1: in complete agreement; "a unanimous decision" [syn:
           consentaneous, consentient, unanimous]
    2: acting together as a single undiversified whole; "a solid
       voting bloc" [syn: solid, unanimous, whole]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "unanimous":
   accordant, affirmative, agreeable, agreed, agreeing, answerable,
   at one, at one with, carried by acclamation, coexistent,
   coexisting, coherent, coincident, coinciding, commensurate,
   compatible, concordant, concurrent, concurring, conformable,
   congenial, congruent, congruous, consentaneous, consentient,
   consistent, consonant, cooperating, cooperative, correspondent,
   corresponding, en rapport, equivalent, harmonious, in accord,
   in agreement, in rapport, in sync, in synchronization,
   inaccordance, inharmony, like-minded, of a piece, of like mind,
   of one accord, of one mind, on all fours, positive, proportionate,
   reconcilable, self-consistent, solid, symbiotic, synchronized,
   synchronous, unchallenged, uncontested, uncontradicted,
   uncontroverted, uniform, unisonant, unisonous, unopposed,
   with one consent, with one voice