Etymology

collisionless

C3O1L1L1I1S1I1O1N1L1E1S1S1

Today it means: That does not involve a collision between particles, bodies, plasmas or waves. Full definition →

Proto-Germanic *lausaz ← Proto-Indo-European *lewHs- ← English collision
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The story

  1. Englishcollision
  2. Proto-Indo-European*lewh₁-
  3. Proto-Indo-European*lewHs-
  4. Proto-Germanic*leusaną
  5. Proto-Germanic*lausaz
  6. English todaycollisionless

From collision + -less.

Etymology from Wiktionary, CC BY-SA 4.0.