Diffusionism is the theory that human culture was spread by degrees by outward expansion from a single source, as opposed to the view that cultures are developed independently and are only diffused when a particular people develops a more or less permanent type of culture which is well in advance of that of neighbouring peoples and becomes impresse...
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http://www.probertencyclopaedia.com/browse/AD.HTM
the theory or principle that diffusion is the main force in cultural innovation and change.
Found on
https://www.infoplease.com/dictionary/diffusionism
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