renewable

from WordNet (r) 3.0 (2006)

renewable
    adj 1: that can be renewed or extended; "a renewable lease";
           "renewable subscriptions" [ant: {nonrenewable},
           {unrenewable}]
    2: capable of being renewed; replaceable; "renewable energy such
       as solar energy is theoretically inexhaustible"

from The Collaborative International Dictionary of English v.0.48

Renewable \Re*new"a*ble\ (r?-n?"?-b'l), a.
   Capable of being renewed; as, a lease renewable at pleasure.
   --Swift.
   [1913 Webster]