- (anthropology) The theory that mankind originated with a single ancestor or ancestral couple.
2003, Roy Porter, Flesh in the Age of Reason, Penguin, published 2004, page 248:
- Some held that negritude was a product of living under the tropical sun, a perhaps beneficial adaptation to a fierce climate – an environmentalist solution chiming with monogenesis and Lockean malleability models.
- (linguistics) The theory that all languages, or a particular set of languages, originated from a single source.
- The emergence from a single cause.