The Collaborative International Dictionary of English v.0.48:

Ripen \Rip"en\, v. i. [imp. & p. p. Ripened;p. pr. & vb. n.
   Ripening.]
   1. To grow ripe; to become mature, as grain, fruit, flowers,
      and the like; as, grapes ripen in the sun.
      [1913 Webster]

   2. To approach or come to perfection.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ripen \Rip"en\, v. t.
   1. To cause to mature; to make ripe; as, the warm days
      ripened the corn.
      [1913 Webster]

   2. To mature; to fit or prepare; to bring to perfection; as,
      to ripen the judgment.
      [1913 Webster]

            When faith and love, which parted from thee never,
            Had ripined thy iust soul to dwell with God.
                                                  --Milton.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ripen
    v 1: cause to ripen or develop fully; "The sun ripens the
         fruit"; "Age matures a good wine" [syn: ripen, mature]
    2: grow ripe; "The plums ripen in July"