Meaning of DIFFUSION in English
n.1 the act or an instance of diffusing; the process of being diffused.
2 Physics & Chem. the interpenetration of substances by the natural movement of their particles.
3 Anthropol. the spread of elements of culture etc. to another region or people.
Etymology: ME f. L diffusio (as DIFFUSE)
Oxford English vocab. Оксфордский английский словарь. 2012