diffusion

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dif·fu·sion / diˈfyoōzhən/ • n. the spreading of something more widely: the diffusion of Marxist ideas. ∎  the action of spreading the light from a light source evenly so as to reduce glare and harsh shadows. ∎  Chem. the intermingling of substances by the natural movement of their particles: the rate of diffusion of a gas. ∎  Anthropol. the dissemination of elements of culture to another region or people.DERIVATIVES: dif·fu·sive / -siv/ adj. ( Chem. ).

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