diffusion

Noun
  1. (physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration (synset 113486733)
  2. The spread of social institutions (and myths and skills) from one society to another (synset 107346200)
  3. The property of being diffused or dispersed (synset 105095263)
  4. The act of dispersing or diffusing something (synset 100369400)
    "the dispersion of the troops"; "the diffusion of knowledge"

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