Etymology

collisional

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Today it means: Of or pertaining to collisions (especially between particles). Full definition →

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

  1. Englishcollision
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todaycollisional

From collision + -al.

Etymology from Wiktionary, CC BY-SA 4.0.