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1. (n.) orthogenesis
evolution of a species proceeding by continuous structural changes without presenting a branching pattern of descent.
2. orthogenesis
a theory that such evolution of a species is due to a predetermined series of alterations and not subject to natural selection.
3. orthogenesis
a hypothetical parallelism between the stages through which every culture necessarily passes in spite of secondary conditioning factors.
Etymology: (1890–95)
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