noun (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(noun.process)

  Synonym:
  development, growing, growth, maturation, ontogeny
  Antonym:
  nondevelopment
  

  source: wordnet30
• The history of the individual 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.(noun)

  source: webster1913