Uni/Bi/Tri/Quad

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Across
  1. 5. – A stand with three legs, often used for cameras.
  2. 7. – To bring things together into one.
  3. 9. – A shape with three sides.
  4. 10. – Something that is one of a kind or special.
  5. 12. – A group of three people or things.
  6. 13. – A person who speaks two languages fluently.
  7. 14. – A three-wheeled vehicle, usually for children.
  8. 15. – Occurring every two weeks.
  9. 16. – An animal that walks on two legs.
Down
  1. 1. – A person who speaks four languages.
  2. 2. – To multiply by four or four times as much.
  3. 3. – A shape with four sides.
  4. 4. – A person who speaks three languages fluently.
  5. 6. – Occurring every two months.
  6. 8. – A mythical horse-like creature with a single horn on its forehead.
  7. 10. – A single, complete part of a larger whole.
  8. 11. – A vehicle with a single wheel.
  9. 13. – A two-wheeled vehicle powered by pedaling.