maturation

(noun) coming to full development; becoming mature. Synonyms: ripening, maturement.

(noun) (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. Synonyms: growth, growing, development, ontogeny, ontogenesis. Example: "He proposed an indicator of osseous development in children."

(noun) (medicine) the formation of morbific matter in an abscess or a vesicle and the discharge of pus. Synonyms: festering, suppuration.