super fun puzzle

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Across
  1. 1. no quantity or number.
  2. 4. to impact or change.
  3. 7. the basic or inherent features of something.
  4. 10. do (something) again, either once or a number of times.
  5. 13. done, produced, or occurring every day.
  6. 15. a thing made to be similar or identical to another.
  7. 16. absolute; complete
  8. 18. express the sense of (words or text) in another language.
  9. 19. acting or speaking sincerely and in earnest, rather than in a joking or halfhearted manner.
  10. 20. a disorder of structure or function in a human, animal, or plant, especially one that produces specific signs or symptoms or that affects a specific location and is not simply a direct result of physical injury.
Down
  1. 2. the opposite of full.
  2. 3. a quantity of something, especially the total of a thing or things in number.
  3. 4. possession of the means or skill to do something.
  4. 5. the lower surface of a room, on which one may walk.
  5. 6. the strength and vitality required for sustained physical or mental activity.
  6. 8. the perceptible natural movement of the air.
  7. 9. a body's relative mass or the quantity of matter contained by it.
  8. 11. being the same in quantity, size, degree, or value.
  9. 12. for all future time; for always.
  10. 14. make (someone) known by name to another in person, especially formally.
  11. 17. the planet on which we live; the world.