To make (something) new again; to restore to freshness or original condition.
To replace (something which has broken etc.); to replenish (something which has been exhausted), to keep up a required supply of.
To make new spiritually; to regenerate.
To become new, or as new; to revive.
To begin again; to recommence.
To repeat.
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?