ev·o·lu·tion
ˌevəˈlo͞oSH(ə)n/
noun
- 1.the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.
synonyms: Darwinism, natural selection "his interest in evolution"
2.
the gradual development of something, especially from a simple to a more complex form.
"the forms of written languages undergo constant evolution"