| n. | 1. | The act of diffusing, or the state of being diffused; a spreading; extension; dissemination; circulation; dispersion. |
| 2. | (Physiol.) The act of passing by osmosis through animal membranes, as in the distribution of poisons, gases, etc., through the body. Unlike absorption, diffusion may go on after death, that is, after the blood ceases to circulate. |
| Noun | 1. | diffusion - (physics) the process of diffusing; the intermingling of molecules in gases and liquids as a result of random thermal agitation |
| 2. | diffusion - the spread of social institutions (and myths and skills) from one society to another | |
| 3. | diffusion - the property of being diffused or dispersed Synonyms: dissemination | |
| 4. | diffusion - the act of dispersing or diffusing something; "the dispersion of the troops"; "the diffusion of knowledge" |