orthogenesis - WordReference.com Dictionary of English

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orthogenesis

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Concise Oxford English Dictionary © 2008 Oxford University Press:
orthogenesis /ˌɔːθə(ʊ)ˈdʒɛnɪsɪs/

▶noun Biology, chiefly historical evolution in which variations follow a particular direction and are not merely sporadic and fortuitous.

– derivatives
orthogenetic adjective.

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