"diffusion" in the noun sense
physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration
the spread of social institutions (and myths and skills) from one society to another
3. dissemination, diffusion
the property of being diffused or dispersed
4. dispersion, dispersal, dissemination, diffusion
the act of dispersing or diffusing something
"the dispersion of the troops"
"the diffusion of knowledge"
Source: WordNet® (An amazing lexical database of English)
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