The Collaborative International Dictionary of English v.0.48:

Acquisitive \Ac*quis"i*tive\, a.
   1. Acquired. [Obs.]
      [1913 Webster]

            He died not in his acquisitive, but in his native
            soil.                                 --Wotton.
      [1913 Webster]

   2. Able or disposed to make acquisitions; acquiring; as, an
      acquisitive person or disposition.
      [1913 Webster]

WordNet (r) 3.0 (2006):

acquisitive
    adj 1: eager to acquire and possess things especially material
           possessions or ideas; "an acquisitive mind"; "an
           acquisitive society in which the craving for material
           things seems never satisfied" [ant: unacquisitive]