Prefixes- uni-, bi-, tri-

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Across
  1. 4. — Able to speak two languages.
  2. 7. — Being joined together as one.
  3. 8. — A vehicle with two wheels.
  4. 10. — A shape with three sides.
  5. 11. — Matching clothing worn by members of a group.
Down
  1. 1. — A mythical horse with one horn.
  2. 2. — Three related books or movies.
  3. 3. — A shape with five sides.
  4. 5. — All of space, stars, and planets.
  5. 6. — Three times as much.
  6. 9. — When people speak or sing at the same time.
  7. 10. — A stand with three legs.