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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biogeny (n.)
1870, "science or doctrine of biogenesis; history of organic evolution;" see bio- + -geny. As "history of the evolution of organisms, genesis or evolution of matter manifesting life (including ontogeny and phylogeny)," 1879.
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