maturing

from The Collaborative International Dictionary of English v.0.48

Mature \Ma*ture"\, v. t. [imp. & p. p. {Matured}; p. pr. & vb.
   n. {Maturing}.] [See {Maturate}, {Mature}.]
   To bring or hasten to maturity; to promote ripeness in; to
   ripen; to complete; as, to mature one's plans. --Bacon.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Maturing \Ma*tur"ing\, a.
   Approaching maturity; as, maturing fruits; maturing notes of
   hand.
   [1913 Webster]