UNI-

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Across
  1. 5. one group
  2. 7. moving in only one direction
  3. 8. a one-wheeled vehicle on which the rider sits and pedals
  4. 9. to join together into one group
  5. 10. one
Down
  1. 1. an instance of saying the same words or sounds at the same time; a group that sounds like one
  2. 2. a horse-like fabled animal that has one horn growing out of the middle of its forehead
  3. 3. one sided
  4. 4. having only one cell
  5. 6. a one-piece leotard and tights combination
  6. 8. one of a kind; unusual or rare