orthogenesis

[ awr-thuh-jen-uh-sis ]
/ ˌɔr θəˈdʒɛn ə sɪs /
|

noun

Biology.
  1. Also called orthoselection.evolution of a species proceeding by continuous structural changes in a single lineage without presenting a branching pattern of descent.
  2. a theory that the evolution of a species in a continuous, nonbranching manner is due to a predetermined series of alterations intrinsic to the species and not subject to natural selection.
Sociology. a hypothetical parallelism between the stages through which every culture necessarily passes, in spite of secondary conditioning factors.

Nearby words

  1. orthodoxy sunday,
  2. orthodromic,
  3. orthoepy,
  4. orthoformate,
  5. orthoformic acid,
  6. orthogenetic,
  7. orthogenic,
  8. orthognathia,
  9. orthognathic,
  10. orthognathic surgery

Origin of orthogenesis

From New Latin, dating back to 1890–95; see origin at ortho-, genesis

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for orthogenesis

  • Eimer, of Germany, has based on facts like these his theory of Orthogenesis.

    The Meaning of Evolution|Samuel Christian Schmucker
  • This theory of Orthogenesis has not figured very strongly in the history of the movement, but it recurs at intervals.

    The Meaning of Evolution|Samuel Christian Schmucker
  • What is the third objection to Darwinism, and what is the bearing upon it of the theory of Orthogenesis?

    The Meaning of Evolution|Samuel Christian Schmucker
  • The same can be said of any one of the teological theories, including the orthogenesis of post-Darwinian writers.

    American Weasels|E. Raymond Hall


British Dictionary definitions for orthogenesis

orthogenesis

/ (ˌɔːθəʊˈdʒɛnɪsɪs) /

noun

biology
  1. evolution of a group of organisms predetermined to occur in a particular direction
  2. the theory that proposes such a development
the theory that there is a series of stages through which all cultures pass in the same order
Derived Formsorthogenetic (ˌɔːθəʊdʒɪˈnɛtɪk), adjectiveorthogenetically, adverb

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012