Etymology

biannual

bi·an·nu·al
B3I1A1N1N1U1A1L1

Today it means: Occurring twice a year; semiannual. Full definition →

English annual ← Latin bi- ← Proto-Italic *dwi-
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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. Englishannual
  7. English todaybiannual

From bi- + annual.

Etymology from Wiktionary, CC BY-SA 4.0.