Etymology

bidirectional

bi·di·rec·tion·al
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Today it means: Moving in two directions (usually opposite). Full definition →

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

  1. Proto-Indo-European*dwóh₁
  2. Proto-Indo-European*dwi-
  3. Proto-Italic*dwi-
  4. Latinbi-
  5. Englishbi-
  6. Englishdirection
  7. Proto-Indo-European*h₂el-
  8. Proto-Indo-European*h₂élisder.?
  9. Englishdirectional
  10. English todaybidirectional

From bi- + directional.

Etymology from Wiktionary, CC BY-SA 4.0.