The Collaborative International Dictionary of English v.0.48:

Deliberative \De*lib"er*a*tive\, n.
   1. A discourse in which a question is discussed, or weighed
      and examined. --Bacon.
      [1913 Webster]

   2. A kind of rhetoric employed in proving a thing and
      convincing others of its truth, in order to persuade them
      to adopt it.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Deliberative \De*lib"er*a*tive\, a. [L. deliberativus: cf. F.
   d['e]lib['e]ratif.]
   Pertaining to deliberation; proceeding or acting by
   deliberation, or by discussion and examination; deliberating;
   as, a deliberative body.
   [1913 Webster]

         A consummate work of deliberative wisdom. --Bancroft.
   [1913 Webster]

         The court of jurisdiction is to be distinguished from
         the deliberative body, the advisers of the crown.
                                                  --Hallam.
   [1913 Webster]

WordNet (r) 3.0 (2006):

deliberative
    adj 1: involved in or characterized by deliberation and
           discussion and examination; "a deliberative body"