1. act of diffusing; state of being diffused.
  2. prolixity of speech or writing; discursiveness.
  3. Physics.
    1. Also called migration.an intermingling of molecules, ions, etc., resulting from random thermal agitation, as in the dispersion of a vapor in air.
    2. a reflection or refraction of light or other electromagnetic radiation from an irregular surface or an erratic dispersion through a surface; scattering.
  4. 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.
  5. Meteorology. the spreading of atmospheric constituents or properties by turbulent motion as well as molecular motion of the air.
  6. Anthropology, Sociology. Also called cultural diffusion. the transmission of elements or features of one culture to another.


  1. the act or process of diffusing or being diffused; dispersion
  2. verbosity
  3. physics
    1. the random thermal motion of atoms, molecules, clusters of atoms, etc, in gases, liquids, and some solids
    2. the transfer of atoms or molecules by their random motion from one part of a medium to another
  4. physics the transmission or reflection of electromagnetic radiation, esp light, in which the radiation is scattered in many directions and not directly reflected or refracted; scattering
  5. Also called: diffusivity physics the degree to which the directions of propagation of reverberant sound waves differ from point to point in an enclosure
  6. anthropol the transmission of social institutions, skills, and myths from one culture to another

late 14c., 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 “pour” (see found (v.2)).


  1. The process of diffusing or the condition of being diffused.
  2. The spontaneous intermingling of the particles of two or more substances as a result of random thermal motion.
  3. dialysis

  1. The movement of atoms or molecules from an area of higher concentration to an area of lower concentration. Atoms and small molecules can move across a cell membrane by diffusion. Compare osmosis.
  2. The reflection or refraction of radiation such as light or sound by an irregular surface, tending to scatter it in many directions.

The spreading of atoms or molecules of one substance through those of another, especially into liquids or gases.

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