#2

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Across
  1. 1. cause (a process or action) to begin.
  2. 5. covering or affecting a large area.
  3. 8. accompanying but not a major part of something.
  4. 10. make (an action or process) easy or easier.
  5. 12. handle or control (a tool, mechanism, etc.), typically in a skillful manner.
  6. 14. denoting an action or event preceding or done in preparation for something fuller or more important.
  7. 16. existing in something as a permanent, essential, or characteristic attribute.
  8. 18. rise and fall irregularly in number or amount.
  9. 19. delay or prevent (someone or something) by obstructing them; hinder.
Down
  1. 2. or appeal to (someone or something) as an authority for an action or in support of an argument.
  2. 3. the quality of seeming reasonable or probable.
  3. 4. continuing firmly or obstinately in a course of action in spite of difficulty or opposition.
  4. 6. certain to happen; unavoidable.
  5. 7. a subtle difference in or shade of meaning, expression, or sound.
  6. 9. possible to do easily or conveniently.
  7. 11. stated clearly and in detail, leaving no room for confusion or doubt.
  8. 13. not connected with or relevant to something.
  9. 15. become aware or conscious of (something); come to realize or understand.
  10. 17. numerical or other measurable factor forming one of a set that defines a system or sets the conditions of its operation.