This document lists prefixes that can be added to words to change their meaning, including bi-, tri-, uni-, re-, and semi-. Some examples of words that incorporate these prefixes are bisect, triangle, universal, semicircle, biceps, bilingual, tricycle, university, semifinal, uniform, bifocals, reunion, unison, semicolon, unicorn, semiprivate, triplicate, semisweet, and semiannual.

1. Spelling bi-, tri-, uni-, re-, semi-
Unit 5 Greensburg goes green

2. bisect

3. triangle

4. universal

5. semicircle

6. biceps

7. bilingual

8. tricycle

9. university

10. semifinal

11. uniform

12. bifocals

13. reunion

14. unison

15. semicolon

16. unicorn

17. semiprivate

18. triplicate

19. semisweet

20. semiannual

21. biplane