资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.

   2. To approach or come to perfection.

资料来源 : WordNet®

ripening
     n 1: coming to full development; becoming mature [syn: {maturation},
           {maturement}]
     2: acquiring desirable qualities by being left undisturbed for
        some time [syn: {aging}, {ageing}]