Uni,Bi,Tri, Other

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Across
  1. 2. An outfit that looks the same as others.
  2. 4. A synonym for being together at the same time.
  3. 7. A five-sided polygon.
  4. 8. To cut into two pieces.
  5. 9. A one-wheeled form of transportation.
  6. 10. A piece of art or literature in three pieces.
  7. 11. A polygon with three angles.
  8. 12. Something that happens 2x per week.
Down
  1. 1. A mythical one-horned creature.
  2. 2. The extremely large place that we call home.
  3. 3. One-of-a-kind.
  4. 5. A four-sided shape.
  5. 6. The month originally named for the 8th month.
  6. 8. Being able to speak two languages.