Etymology

investigational

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Today it means: Of, or relating to investigating, or to an investigation. Full definition →

Proto-Indo-European *h₂élisder.? ← English investigation ← Middle English investigacioun
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The story

  1. Middle Englishinvestigacioun
  2. Englishinvestigation
  3. Proto-Indo-European*h₂el-
  4. Proto-Indo-European*h₂élisder.?
  5. English todayinvestigational

From investigation + -al.

Etymology from Wiktionary, CC BY-SA 4.0.