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  27. 0-9
  1. -o ... object–oriented
  2. object–oriented programming ... occidentalize
  3. occipital ... odonate
  4. odont- ... offset
  5. offshoot ... old swedish
  6. old testament ... ominous
  7. omissible ... onshore
  8. onside ... opera buffa
  9. opéra comique ... optimism
  10. optimist ... ore dressing
  11. oread ... orography
  12. oromo ... ossa
  13. ossein ... ounce
  14. our ... outlive
  15. outlook ... overact
  16. overactive ... overplaid
  17. overplay ... ovule
  18. ovum ... ozonosphere