Roots #18: plic, ply

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Across
  1. 3. The mathematical act of repeated folding or increasing.
  2. 5. Something that is a folded copy; a double.
  3. 6. Not folded together in a complex way; simple.
  4. 7. To fold back upon itself, to make a copy.
  5. 8. To fold or put something onto a surface or a use.
  6. 9. One who is folded into a crime with another.
Down
  1. 1. The state of being unfolded, with nothing hidden.
  2. 2. To fold many times, to increase in number.
  3. 4. A state of being folded together in a complex way.