ev·o·lu·tion/ˏɛvə`luʃən; ˌiːvəˈluːʃən/ n [U] 1 the gradual development of plants and animals that happens over millions of years 〔生物的〕进化: Darwin's theory of evolution 达尔文的进化论 2 the gradual change and development 演变，逐步发展: + of the evolution of computer technology 电脑科技的发展