[syn: ripening, aging, ageing]
The Collaborative International Dictionary of English v.0.48:
Ripen \Rip"en\, v. i. [imp. & p. p. Ripened;p. pr. & vb. n.
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.
WordNet (r) 3.0 (2006):
n 1: coming to full development; becoming mature [syn:
maturation, ripening, maturement]
2: acquiring desirable qualities by being left undisturbed for
some time [syn: ripening, aging, ageing]