What do you call something that happens every 3 years?

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Tags

  1. #substitute
  2. #phrase
  3. #between
  4. #years
  5. #months
  6. #ambiguous
  7. #often
  8. #triennial
  9. #avoid
  10. #better
  11. #every
  12. #triannual
  13. #three
  14. #times
  15. #confusion