9 letters · 16 points in Scrabble
noun (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
noun the spread of social institutions (and myths and skills) from one society to another
noun the property of being diffused or dispersed
originBorrowed from Latin diffūsiō, from diffundō; can be decomposed as diffuse + -ion.
Etymology from Wiktionary, CC BY-SA 3.0