Uni/Bi/Tri/Quad

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Across
  1. 2. A tight-fitting one-piece garment covering the body from the neck to the legs.
  2. 3. A flat shape with four straight sides.
  3. 4. An airplane with two pairs of wings, one above the other.
  4. 7. A vehicle with one wheel, usually ridden for fun or in performances.
  5. 11. Moving or operating in only one direction.
  6. 14. A single thing or person regarded as a whole.
  7. 15. One of a kind; unlike anything else.
  8. 18. To divide something into four parts.
  9. 20. An animal that walks on four feet.
  10. 21. To divide something into three equal parts.
  11. 22. Made up of only one cell.
  12. 24. A stand with three legs, used to support a camera or other device.
  13. 26. A group of three people or things.
  14. 27. An animal that walks on two legs.
  15. 28. A three-wheeled vehicle, often used by young children.
  16. 30. Eyeglasses with lenses having two parts for near and distant vision.
  17. 31. Happening every two years.
  18. 33. A mythical animal resembling a horse with a single horn on its forehead.
  19. 36. Able to speak three languages fluently.
Down
  1. 1. One of four equal parts of a circle or coordinate grid.
  2. 3. To increase or make something four times as large.
  3. 5. Done by or involving only one side or person.
  4. 6. A tooth with two points or cusps.
  5. 8. Able to speak two languages fluently.
  6. 9. The large muscle group at the front of the thigh made up of four parts.
  7. 10. A large dinosaur with three horns on its head.
  8. 12. One of four children born at the same time to the same mother.
  9. 13. Happening every four years.
  10. 16. Occurring twice a month or once every two months.
  11. 17. A four-sided open area surrounded by buildings, especially in a school or college.
  12. 19. Able to speak four languages fluently.
  13. 23. Acting or speaking together at the same time; harmony.
  14. 25. Happening every two weeks or twice a week.
  15. 26. A group of three related books, movies, or plays.
  16. 28. Involving three sides, groups, or countries.
  17. 29. To bring together or combine into one group or unit.
  18. 32. A shape with three sides and three angles.
  19. 34. A vehicle with two wheels that you pedal to move.
  20. 35. Having two different colors.
  21. 36. A race with three parts: swimming, cycling, and running.