creationismPronunciation: /kriːˈeɪʃ(ə)nɪz(ə)m/Definition of creationism noun [mass noun] the belief that the universe and living organisms originate from specific acts of divine creation, as in the biblical account, rather than by natural processes such as evolution. another term for creation science.Derivatives creationist noun & adjective creationism in other Oxford dictionaries Definition of creationism in the US English dictionary