[1] : The Collaborative International Dictionary of English v.0.48

ontogenesis \on`togen"esis\, ontogeny \ontog"eny\, n. see
   ontology, and genesis. biol.
   the history of the individual development of an organism; the
   sequence of events involved in the development of an
   organism; the history of the evolution of the germ; the
   development of an individual organism, -- in distinction from
   phylogeny, or evolution of the tribe. called also
   henogenesis, henogeny.

   syn: growth, growing, maturation, development.
        1913 webster
see also:
ontology genesis phylogeny henogenesis henogeny 

[2] : WordNet (r) 2.0

ontogenesis
     n : 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" syn: growth, growing,
          maturation, development, ontogeny ant: nondevelopment
see also:
growth growing maturation development ontogeny nondevelopment 

Ontogenesis >> O Words
Ontogenesis, definition of term: Ontogenesis
ontogenesis_pag1.html