Who decides what's in the dictionary?

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Across
  1. 6. producing wealth
  2. 8. an insulting remark, word or phrase
  3. 10. not required
  4. 12. someone who is forced to do hard, dull or tedious work
  5. 14. to prevent the inclusion or entrance of
  6. 15. no longer current
  7. 16. a dictionary which dictates rules and methods how words should be used - implicates a correctness
Down
  1. 1. not causing pain or danger
  2. 2. elevated in character in status, compared to others
  3. 3. a dictionary in that aims to indicate how words are actually used by current day speakers
  4. 4. to encompass in a group, decision or activity
  5. 5. to take up gladly or readily
  6. 7. to imply to opposite or a denial of
  7. 9. created or arising from spite or hatred
  8. 11. made of complicated or interrelated parts
  9. 13. informal, non-standard vocabulary peculiar to a group