<p><strong>Noun</strong></p><ul><li>the act of diffusing or state of being diffused: During the gradual, unorchestrated diffusion of ideas from science into the surrounding culture, crucial information can sometimes be lost.</li><li>excessive wordiness of speech or writing; long-windedness.</li><li>Physics. Also called migration.</li><li>an intermingling of molecules, ions, etc., resulting from random thermal agitation, as in the dispersion of a vapor in air.</li><li>a reflection or refraction of light or other electromagnetic radiation from an irregular surface, or an erratic dispersion through a surface; scattering.</li><li>Movies. a soft-focus effect resulting from placing a gelatin or silk plate in front of a studio light or a camera lens, or through the use of diffusion filters.</li><li>Meteorology. the spreading of atmospheric constituents or properties by turbulent motion as well as molecular motion of the air.</li><li>Anthropology, Sociology. Also called cultural diffusion [kuhl, -cher-, uh, l di-, fyoo, -zh, uh, n].</li><li>the transmission of elements or features of one culture to another.</li></ul>