Ma'anar ƙamus na kalmar "juyin halitta" ita ce:Tsarin da ake tunanin nau'o'in rayayyun halittu daban-daban sun samo asali kuma sun bambanta daga sifofin farko a tarihin duniya. Ci gaban wani abu a hankali, musamman daga sauƙi zuwa tsari mai rikitarwa. .