S: (n) growth, growing, maturation, development, ontogeny, ontogenesis ((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"
S: (n) process, physical process (a sustained phenomenon or one marked by gradual changes through a series of states) "events now in process"; "the process of calcification begins later for boys than for girls"