say it: di-FYOO-zhuhn
diffusion is a noun meaning "(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". It carries 4 recorded senses.
(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
physics
the spread of social institutions (and myths and skills) from one society to another
mythology
the property of being diffused or dispersed
the act of dispersing or diffusing something
“the dispersion of the troops”
“the diffusion of knowledge”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for diffusion come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.