Across
- 4. lasting for two years
- 6. to make one, or cause to become one
- 9. of or pertaining to one language
- 11. lasting for, consisting of, or taking place every two hundred years
- 12. the number named by a unit with nine zeros after it
- 13. of or pertaining to two languages
- 16. a one-wheeled vehicle
- 18. a plane geometric figure of three sides and three angles
- 20. the number named by a unit with twelve zeros after it
- 21. a three-legged stand or support
Down
- 1. two;twice
- 2. one;single
- 3. taking place twice a year
- 4. a two-winged airplane
- 5. of or pertaining to three languages
- 7. a two-footed animal
- 8. being three-sided
- 10. to cut or divide something into two parts
- 14. being one-sided
- 15. a one-legged support
- 17. three;three times
- 19. an animal written about in fables