diffusion

noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about diffusion at Wordnik → Where our words come from →

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.
2. The spread of social institutions (and myths and skills) from one society to another.
3. The property of being diffused or dispersed.