microevolution
noun
mi·cro·evo·lu·tion ˌmī-krō-ˌe-və-ˈlü-shən 
also -ˌē-və-
: comparatively minor evolutionary change involving the accumulation of variations in populations usually below the species level
microevolutionary
ˌmī-krō-ˌe-və-ˈlü-shə-ˌner-ē
adjective also -ˌē-və-
Example Sentences
Recent Examples on the Web New Paranthropus robustus fossils from South Africa show microevolution within a single species. 
Briana Pobiner And Ryan Mcrae, Smithsonian Magazine, 28 Dec. 2021 The differences between fossils at the two sites highlight microevolution within this Paranthropus lineage. Briana Pobiner And Ryan Mcrae, Smithsonian Magazine, 28 Dec. 2021 This find is the first evidence of microevolution—the changes within a population of one species over time—in early hominids, reports the Australian Associated Press. Rasha Aridi, Smithsonian Magazine, 13 Nov. 2020 Some of these teachers might even introduce evolutionary ideas such as natural selection and microevolution. Olga Khazan, The Atlantic, 19 Sep. 2019 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 To get samples from other species, Dr. Carlton has enlisted the aid of a Fordham University biologist, Jason Munshi-South, who studies the travel patterns and microevolution of rodents in the city. Andy Newman, New York Times, 7 Apr. 2017 See More
Briana Pobiner And Ryan Mcrae, Smithsonian Magazine, 28 Dec. 2021 The differences between fossils at the two sites highlight microevolution within this Paranthropus lineage. Briana Pobiner And Ryan Mcrae, Smithsonian Magazine, 28 Dec. 2021 This find is the first evidence of microevolution—the changes within a population of one species over time—in early hominids, reports the Australian Associated Press. Rasha Aridi, Smithsonian Magazine, 13 Nov. 2020 Some of these teachers might even introduce evolutionary ideas such as natural selection and microevolution. Olga Khazan, The Atlantic, 19 Sep. 2019 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 To get samples from other species, Dr. Carlton has enlisted the aid of a Fordham University biologist, Jason Munshi-South, who studies the travel patterns and microevolution of rodents in the city. Andy Newman, New York Times, 7 Apr. 2017 See More Word History
First Known Use
1911, in the meaning defined above
Medical Definition
microevolution
noun
mi·cro·evo·lu·tion
ˈmī-krō-ˌev-ə-ˈlü-shən also -ˌē-və-
: comparatively minor evolutionary change involving the accumulation of variations in populations usually below the species level