Etymology

operationalism

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Today it means: A philosophy that attempts to define all scientific concepts in terms of specified operations or procedures of observation and measurement. Full definition →

English operational ← Proto-Indo-European *h₂élisder.? ← Middle English operacioun
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The story

  1. Proto-Indo-European*h₃ep-
  2. Proto-Indo-European*h₃épos
  3. Proto-Italic*opos
  4. Latinopus
  5. Latinopera
  6. Latinoperātusbf.
  7. Latinoperor
  8. Latinoperātiō
  9. Old Frenchoperacion
  10. Middle Englishoperacioun
  11. Englishoperation
  12. Proto-Indo-European*h₂el-
  13. Proto-Indo-European*h₂élisder.?
  14. Englishoperational
  15. English todayoperationalism

From operational + -ism.

Etymology from Wiktionary, CC BY-SA 4.0.