(1):

(v. t.) To cause to mature; to make ripe; as, the warm days ripened the corn.

(2):

(v. i.) To approach or come to perfection.

(3):

(v. i.) To grow ripe; to become mature, as grain, fruit, flowers, and the like; as, grapes ripen in the sun.

(4):

(v. t.) To mature; to fit or prepare; to bring to perfection; as, to ripen the judgment.