Demic diffusion

Demic diffusion is a demographic term referring to a migratory model, developed by Cavalli-Sforza, that consists of population diffusion into and across an area previously uninhabited by that group, possibly, but not necessarily, displacing, replacing, or intermixing with a pre-existing population (such as has been suggested for the spread of agriculture across Neolithic Europe and several other Landnahme events).