1. To make (something) new again; to restore to freshness or original condition.
  2. To replace (something which has broken etc.); to replenish (something which has been exhausted), to keep up a required supply of.
  3. To make new spiritually; to regenerate.
  4. To become new, or as new; to revive.
  5. To begin again; to recommence.
  6. To repeat.
  7. To extend a period of loan, especially a library book that is due to be returned.
    I'd like to renew these three books.
    Did you know that you can renew online?

The above text is a snippet from Wiktionary: renew
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