Eager to acquire; greedy.
Example:
With each year the couple became more madly acquisitive, buying jewelry, a huge yacht, and two country estates.
Many have observed that we live in an acquisitive society, a society devoted to getting and spending, unlike most tribal societies and some older nations. America often makes successfully acquisitive people into heroes; even Ebenezer Scrooge, that model of miserly greed and acquisitiveness, was once defended by the White House chief of staff. An acquisitive nation may seek to acquire other territories by force. But mental acquisition of specialized knowledge of skills -- or new vocabulary! -- doesn't deprive others of the same information.