Definitions of evolution on the Web:
development: 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"
(biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms
wordnet.princeton.edu/perl/webwn
In the life sciences, evolution is a change in the traits of living organisms over generations, including the emergence of new species. Since the development of modern genetics in the 1940s, evolution has been defined more specifically as a change in the frequency of alleles in a population from one generation to the next.In other fields evolution is used more generally to refer to any process of change over time.
en.wikipedia.org/wiki/Evolution
Wikipedia is not a reliable, trustworthy source. That's because anybody can go in there and write anything they want. I've done it myself.