evolution/͵ɛvəˋluʃən; ˌiːvəˈluːʃ$n/n [U] 1 the gradual development of plants and animals over millions of years〔生物的〕进化: Darwin's theory of evolution 达尔文的进化论2 the gradual development of an idea, situation, or object 演变﹐逐步发展: +of the evolution of computer technology 电脑科技的发展evolutionary adj