\\-zhəˌnizəm\ noun
: a theory in anthropology: widely separated cultural similarities are evidence of historical contact

* * *

diffusionist, n., adj.
/di fyooh"zheuh niz'euhm/, n. Anthropol.
the theory or principle that diffusion is the main force in cultural innovation and change.
[1935-40; DIFFUSION + -ISM]

* * *

diffūˈsionism noun (anthropology)
The theory that diffusion is mainly responsible for cultural similarities
• • •
Main Entry:diffuse

Useful english dictionary. 2012.