Dictionary of Human Evolution and Biology

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1. the process of becoming widely spread.

2. in anthropology, the transmission of elements of a particular culture among synchronic members of a generation, often to another culture, and one of four of Fagan’s models used to characterize culture change; cf. enculturation.

3. in genetics, the spread of an advantageous phenotype through space and time, often leaving as evidence a cline.

4. in chemistry, the random movement of molecules from a region of higher to lower molecular concentration.

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