Etymology

diffusional

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Today it means: Of or pertaining to diffusion. Full definition →

Proto-Indo-European *h₂élisder.? ← English diffusion
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The story

  1. Englishdiffusion
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todaydiffusional

From diffusion + -al.

Etymology from Wiktionary, CC BY-SA 4.0.