ADJECTIVE (2)

1. that can be renewed or extended;
- Example: "a renewable lease"
- Example: "renewable subscriptions"

2. capable of being renewed; replaceable;
- Example: "renewable energy such as solar energy is theoretically inexhaustible"

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]

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"