The Collaborative International Dictionary of English v.0.48:

Maturation \Mat`u*ra"tion\, n. [L. maturatio a hastening: cf. F.
   maturation.]
   The process of bringing, or of coming, to maturity; hence,
   specifically, the process of suppurating perfectly; the
   formation of pus or matter.
   [1913 Webster]

WordNet (r) 3.0 (2006):

maturation
    n 1: coming to full development; becoming mature [syn:
         maturation, ripening, maturement]
    2: (biology) the process of an individual organism growing
       organically; a purely biological unfolding of events involved
       in an organism changing gradually from a simple to a more
       complex level; "he proposed an indicator of osseous
       development in children" [syn: growth, growing,
       maturation, development, ontogeny, ontogenesis] [ant:
       nondevelopment]
    3: (medicine) the formation of morbific matter in an abscess or
       a vesicle and the discharge of pus [syn: festering,
       suppuration, maturation]