uni-

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Across
  1. 3. one sided
  2. 6. a group that sounds like one
  3. 7. a one-wheeled vehicle
  4. 8. having only one cell
  5. 9. a horse-like fabled animal that has one horn
Down
  1. 1. one group
  2. 2. moving in only one direction
  3. 4. to join together into one group
  4. 5. one of a kind
  5. 7. a one-piece leotard and tights combination