The noun evolution has 2 senses (first 1 from tagged texts)
1. (5) development, evolution -- (a process in which something passes by degrees to a different stage (especially a more advanced or mature stage); "the development of his ideas took many years"; "the evolution of Greek civilization"; "the slow development of her skill as a writer")
2. evolution, organic evolution, phylogeny, phylogenesis -- ((biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms)