Etymology

annum

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Today it means: A one-year period, particularly (finance) a fiscal year or (sciences) a Julian year of exactly 365.25 days. Full definition →

Latin per annum
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The story

  1. Latin · borrowed fromper annum“yearly”
  2. English todayannum

From Latin per annum (“yearly”), from annus (“year”).

Etymology from Wiktionary, CC BY-SA 4.0.