Definition of diffusion noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//dɪˈfjuːʒn//
    ; NAmE NAmE//dɪˈfjuːʒn//
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  1. 1(formal) the act of spreading something widely in all directions; the fact of being spread in all directions the diffusion of Marxist ideas
  2. 2(specialist) the act of slowly mixing a gas or liquid in a substance; the process in which this happens the rate of diffusion of a gas
  3. 3(formal) the act of making a light shine less brightly by spreading it in many directions the diffusion of light by a convex surface