What is the meaning of evolution?

noun

• A process in which something passes by degrees to a different stage (especially a more advanced or mature stage. )
  • usage: "the development of his ideas took many years"; "the evolution of Greek civilization"; "the slow development of her skill as a writer"
  • synonyms: development
• Biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms. (.
  • synonyms: organic evolution, phylogeny, phylogenesis