WordNet sense 1 (coming to full development; becoming mature):

maturement, ripening

WordNet sense 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):

development, growth, ontogeny, growing, ontogenesis

WordNet sense 3 ((medicine) the formation of morbific matter in an abscess or a vesicle and the discharge of pus):

suppuration, festering