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From The Collaborative International Dictionary of English v.0.48:
Ontogenesis \On`to*gen"e*sis\, Ontogeny \On*tog"e*ny\, 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]