LATIN DICTIONARYLexicon Latīnum
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“diffusion” in Latin

The English word diffusion itself goes back to Latin fundō, through diffūsiō.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

diffusion
extentio or extensio (extension, Vitr. 9, 1, 13): prolatio (act of carrying further; finium, Liv.): propagatio (the act of widening or extending; e.g., finium, imperii): Mostly by circumlocution [☞ diffusio, Sen., ; but only in diffusio animi; disseminatio, very late; evangelii, Tert.

Quick answer

What is the Latin word for diffusion?
The usual Latin words for “diffusion” are extēnsiō, prōlātiō, prōpāgātiō; also fīnis, imperium, dissēminātiō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.