macroevolution

noun

mac·​ro·​evo·​lu·​tion ˈma-krō-ˌe-və-ˈlü-shən How to pronounce macroevolution (audio)
also -ˌē-və-
: evolution that results in relatively large and complex changes (as in species formation)

Examples of macroevolution in a Sentence

Recent Examples on the Web
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Identifying species and the process by which new species emerge from fossils falls in the realm of macroevolution, or evolution over broad time scales. Briana Pobiner and Ryan McRae, Smithsonian Magazine, 28 Dec. 2021 These facts are every bit as solid and universally attested as climate change or macroevolution. Samuel James, National Review, 14 Feb. 2020 Rather, Abzhanov showed that the same forces that shape microevolution — minor alterations within species — also drive macroevolution, the evolution of whole new features and new groups of species. Quanta Magazine, 2 June 2015 Jon Tennant is currently undertaking a PhD in vertebrate macroevolution in London. Guest Blogger, Discover Magazine, 21 Feb. 2013 Ecological change provokes speciation and extinction, but our knowledge of the interplay among the biotic and abiotic drivers of macroevolution remains limited. Razib Khan, Discover Magazine, 20 Apr. 2011

Word History

Etymology

macro- + evolution, probably after French macroévolution

First Known Use

1937, in the meaning defined above

Time Traveler
The first known use of macroevolution was in 1937

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Cite this Entry

“Macroevolution.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/macroevolution. Accessed 28 Jul. 2026.

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