[noun] (physics) the process of diffusing; the intermingling of molecules in gases and liquids as a result of random thermal agitation
[noun] the spread of social institutions (and myths and skills) from one society to another
[noun] the property of being diffused or dispersed Synonyms:dissemination
[noun] the act of dispersing or diffusing something; "the dispersion of the troops"; "the diffusion of knowledge" Synonyms:dispersion, dispersal, dissemination