Etymology

semiquincentennial

sem·i·quin·cent·en·ni·al

Today it means: Of or relating to a 250th anniversary. Full definition →

English quincentennial ← Proto-Indo-European *h₂élisder.? ← Late Latin centennium
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The story

  1. Proto-Indo-European*sem-
  2. Proto-Indo-European*sēmi
  3. Latinsēmi-
  4. Englishsemi-
  5. Proto-Indo-European*pénkʷe
  6. Proto-Italic*kʷenkʷe
  7. Latinquīnque
  8. Englishquin-
  9. Latincentennis
  10. Late Latincentennium
  11. Proto-Indo-European*h₂el-
  12. Proto-Indo-European*h₂élisder.?
  13. Englishcentennial
  14. Englishquincentennial
  15. English todaysemiquincentennial

From semi- (prefix meaning ‘half’) + quincentennial (“500th anniversary”).

Etymology from Wiktionary, CC BY-SA 4.0.