Definition of diffusion
1 : the state of being spread out or transmitted especially by contact : the action of diffusing the diffusion of knowledge
3a chemistry : the process whereby particles of liquids, gases, or solids intermingle as the result of their spontaneous movement caused by thermal (see thermal entry 1 sense 1b) agitation and in dissolved substances move from a region of higher to one of lower concentrationb physics
4 : the spread of cultural elements from one area or group of people to others by contact
5 photography : the softening of sharp outlines in an image
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