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Definition of ontogeny:

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.

Synonyms:

emergence, growing, increase, growth, ontogenesis, developing, evolution, ripening, development, maturation, outgrowth, increment, suppuration, exploitation, festering, maturement.

Usage examples:

Cause for variation and consequently for variety formation is always shown, either when, environment remaining the same, the automatic variation of the idioplasm has advanced so far that the ontogeny is raised to a higher grade of organization and division of labor, or when external stimuli act for a sufficiently long time in a manner not in harmony with the previous adaptation.

- "A Mechanico-Physiological Theory of Organic Evolution", Carl Von Nägeli.
5. A definite and previously limited growth continues, or a definite formation of parts of an ontogeny which has previously been present but once, is repeated.

- "A Mechanico-Physiological Theory of Organic Evolution", Carl Von Nägeli.
It is expressed by the formula of Herbert Spencer, " Ontogeny recapitulates phylogeny."

- "Education: How Old The New", James J. Walsh.