Etymology
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ontogeny (n.)

"development of an individual living organism, history of the individual development of a living being," 1872, from onto- + -geny. Related: Ontogenic; ontogenesis.

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Definitions of ontogeny

ontogeny (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;
Synonyms: growth / growing / maturation / development / ontogenesis
From wordnet.princeton.edu