Uni

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