1. Diffusion — noun — /dɪˈfjuːʒn/ — the process of spreading something broadly in every direction; the state of being dispersed (e.g., the diffusion of Marxist concepts).
   
   Oxford University Press, diffusion noun, Oxford Learner's Dictionaries (2026), available at https://www.oxfordlearnersdictionaries.com/definition/english/diffusion.
2. In sound engineering, the parameter controlling the dispersion and density of reflections in a reverberant signal, with low values producing sparser and more distinct individual reflections and high values yielding a denser, smoother, more uniform reverb tail.
   
   N. Lavandier, J. Koehl, What is Reverb? The Reverb Resource for Audio Engineers of All Levels, iZotope (2023), available at https://www.izotope.com/en/learn/what-is-reverb.
3. In evidence accumulation models (cognitive psychology and neuroscience), the stochastic component of the decision process that introduces moment-to-moment noise into the temporal accumulation of evidence.
   
   Brown, S. D. & Heathcote, A. The simplest complete model of choice response time: Linear ballistic accumulation. Cognit. Psychol. 57, 153–178 (2008), available at: https://doi.org/10.1016/j.cogpsych.2007.12.002.

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