monogenesis

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mon·o·gen·e·sis / ˌmänəˈjenəsəs/ • n. the theory that humans are all descended from a single pair of ancestors.Also called monogeny. ∎  Linguistics the hypothetical origination of language or of a surname from a single source at a particular place and time.DERIVATIVES: mon·o·ge·net·ic / -jəˈnetik/ adj.