Etymology

biennial

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Today it means: Happening every two years. Full definition →

Latin bienni(um)
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The story

  1. Latin · borrowed frombienni(um)“two-year period”
  2. English todaybiennial

Borrowed from Latin bienni(um) (“two-year period”) [from bis, bi- (“twice”) + annus (“year”)] + -al (suffix forming adjectives). By surface analysis, bi- + -ennial.

Etymology from Wiktionary, CC BY-SA 4.0.