orthogenesis

noun

or·​tho·​gen·​e·​sis ˌȯr-thə-ˈje-nə-səs How to pronounce orthogenesis (audio)
: variation of organisms in successive generations that in some especially former evolutionary theories takes place in some predestined direction resulting in progressive evolutionary trends independent of external factors
orthogenetic adjective
orthogenetically adverb

Example Sentences

Recent Examples on the Web Sperm structure and motility in the eusocial naked mole-rat, Heterocephalus glaber: a case of degenerative orthogenesis in the absence of sperm competition? Ed Yong, Discover Magazine, 4 Dec. 2011 The various models proposed for the mechanism of evolution, such as Lamarckian evolution, orthogenesis and use-disuse, all implied some level of teleology: that there was a directionality inherent in the process. Mano Singham, Scientific American, 5 Sep. 2021 The various models proposed for the mechanism of evolution, such as Lamarckian evolution, orthogenesis, and use-disuse, all implied some level of teleology, that there was a directionality inherent in the process. Mano Singham, Scientific American, 5 Sep. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'orthogenesis.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

Etymology

New Latin

First Known Use

1895, in the meaning defined above

Time Traveler
The first known use of orthogenesis was in 1895

Dictionary Entries Near orthogenesis

Cite this Entry

“Orthogenesis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/orthogenesis. Accessed 4 Feb. 2023.

Medical Definition

orthogenesis

noun
or·​tho·​gen·​e·​sis ˌȯr-thə-ˈjen-ə-səs How to pronounce orthogenesis (audio)
plural orthogeneses -ˌsēz How to pronounce orthogenesis (audio)
: variation of organisms in successive generations that in some evolutionary theories takes place in some predestined direction and results in progressive evolutionary trends independent of external factors
orthogenetic adjective

More from Merriam-Webster on orthogenesis

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