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