Etymology

centennial

C3E1N1T1E1N1N1I1A1L1

Today it means: Relating to, or associated with, the commemoration of an event that happened a hundred years before. Full definition →

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

  1. Latincentennis
  2. Late Latincentennium
  3. Proto-Indo-European*h₂el-
  4. Proto-Indo-European*h₂élisder.?
  5. English todaycentennial

From Late Latin centennium (“period of 100 years, century”) + English -al (suffix forming adjectives and nouns).

Etymology from Wiktionary, CC BY-SA 4.0.