Definition of diffusion
1
: the state of being spread out or transmitted especially by contact : the action of diffusing
- the diffusion of knowledge
2
: prolixity, diffuseness
3 a
chemistry
: the process whereby particles of liquids, gases, or solids intermingle as the result of their spontaneous movement caused by thermal (see 1thermal 1b) agitation and in dissolved substances move from a region of higher to one of lower concentration
b
physics
(1)
: reflection of light by a rough reflecting surface
(2)
: transmission of light through a translucent material : scattering
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
