Etymology

interplanetary

I1N1T1E1R1P3L1A1N1E1T1A1R1Y4

Today it means: Existing or occurring between planets. Full definition →

English planetary ← Latin inter- ← Proto-Italic *n̥ter
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The story

  1. Proto-Indo-European*h₁én
  2. Proto-Indo-European*h₁n̥tér
  3. Proto-Italic*n̥ter
  4. Latininter
  5. Latininter-
  6. Englishinter-
  7. Englishplanet
  8. Englishplanetary
  9. English todayinterplanetary

From inter- + planetary.

Etymology from Wiktionary, CC BY-SA 4.0.