What is once every 6 months called?

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  1. #either
  2. #because
  3. #months
  4. #every
  5. #twice
  6. #periodicity
  7. #regular
  8. #times
  9. #means
  10. #happens
  11. #semiannual
  12. #period
  13. #something
  14. #preferred
  15. #clarity
  16. #which
  17. #occurrence