Definition of: diffusion

(di·fy′zhən) noun
1. The act or process of diffusing, or the state of being diffused; a scattering; dissemination; dispersion; circulation.
2. Prolixity; diffuseness of verbal expression.
3. The scattering and criss–crossing of light rays, producing general illumination rather than direct radiation.
4. Physics The intermingling by thermal agitation of the atoms or molecules of two substances initially unmixed but in contact.
5. Anthropol. The transmission of culture traits from one area, group, or people to another.