Definition of diffusions:
(n) :
The act of diffusing or dispersing something, or the property of being diffused or dispersed; dispersion.
(n) :
The spread of cultural or linguistic practices, or social institutions, in one or more communities.
(n) :
(marketing) The gradual spread and adoption of goods or services.
(n) :
(physics) The intermingling of the molecules of a fluid due to random thermal agitation.
(n) :
(physics) The scattering of light by reflection from a rough surface, or by passage through a translucent medium.
(n) :
(physics, weather) Exchange of airborne media between regions in space in an apparently random motion of a small scale.