Etymology

unidirectional

uni·di·rec·tion·al
U1N1I1D2I1R1E1C3T1I1O1N1A1L1

Today it means: Pertaining to only one direction, e.g.: where all component parts are aligned in the same direction in space. Full definition →

English directional ← Proto-Indo-European *h₂élisder.? ← Latin ūni-
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The story

  1. Proto-Indo-European*ís?
  2. Proto-Indo-European*h₁óynos
  3. Proto-Italic*oinos
  4. Old Latinoinos
  5. Latinūnus
  6. Latinūni-
  7. Englishuni-
  8. Englishdirection
  9. Proto-Indo-European*h₂el-
  10. Proto-Indo-European*h₂élisder.?
  11. Englishdirectional
  12. English todayunidirectional

From uni- + directional.

Etymology from Wiktionary, CC BY-SA 4.0.