Name that Prefix

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Across
  1. 3. animal with 1 horn
  2. 7. working by itself
  3. 9. unable to do something
  4. 11. to meet
  5. 13. smallest version
  6. 14. to beat in a game
  7. 15. earlier in time
  8. 16. a way to move people
  9. 19. to make better
  10. 20. not legal
Down
  1. 1. to stretch out
  2. 2. small
  3. 4. not patient
  4. 5. to breath out
  5. 6. piece of clothing worn by a whole team
  6. 8. bike with 1 wheel
  7. 10. to draw a logical conclusion
  8. 12. a book about the story of someone's life
  9. 17. not regular
  10. 18. to reduce