Etymology
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diffusion (n.)

late 14c., diffusioun, "a copious outpouring," from Old French diffusion and directly from Latin diffusionem (nominative diffusio) "a pouring forth," noun of action from past-participle stem of diffundere "scatter, pour out," from dis- "apart, in every direction" (see dis-) + fundere "to pour" (from nasalized form of PIE root *gheu- "to pour"). Meaning "act of diffusing, state of being diffuse" is from 1590s; figurative sense of "a spreading abroad, dispersion" (of knowledge, etc.) is by 1750.

Origin and meaning of diffusion

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Definitions of diffusion

diffusion (n.)
(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;
diffusion (n.)
the spread of social institutions (and myths and skills) from one society to another;
diffusion (n.)
the property of being diffused or dispersed;
Synonyms: dissemination
diffusion (n.)
the act of dispersing or diffusing something;
the diffusion of knowledge
From wordnet.princeton.edu