Webster's English Dictionary

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maturation

mat.u.ra.tion \.mach-*-'ra--sh*n\ \-shn*l, -sh*n-*l\ \m*-'t(y)u.r-*t-iv\ n 
   1a: the process of becoming mature  1b: the emergence of personal 
   characteristics and behavioral phenomena thro ugh growth processes 1c: the 
   final stages of differentiation of cells, tissues, or organs  2a: the 
   entire process by which diploid gonocytes are transformed into hapl oid 
   gametes involving meiosis accompanied in the female or followed in the male 
   by physiological and structural changes fitting the gamete for its future 
   role 2b: SPERMIOGENESIS  - mat.u.ra.tion.al aj