Science
Chemistry
- Functional group, a functional entity consisting of certain atoms whose presence provides a certain property to a molecule
- Group (periodic table), a column in the periodic table of chemical elements
Biology
- Cultivar group, a formal classification category in the International Code of Nomenclature for Cultivated Plants (ICNCP)
- Group selection, in evolutionary biology, the idea that alleles can become fixed or spread in a population because of the benefits they bestow upon groups of organisms
Cosmology
- Galaxy groups and clusters, a small number of galaxies near each other
- Local Group, the group containing the Milky Way Galaxy
Other
- Group delay and phase delay
- a set of lenses stacked together
- Group (stratigraphy), in geology, a lithostratigraphical unit; a group consists of formations, or rock strata
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—Ralph Waldo Emerson (1803–1882)