Across
- 3. - Three times or a group of three
- 4. - Group of three persons or things
- 8. - Act of joining together or a group of workers
- 12. - Joined or brought together as one
- 14. - Marine mollusk with eight arms
- 15. - All existing matter, space, and time
- 16. - Geometric shape with five sides
- 18. - One of a kind or having no equal
- 19. - Geometric shape with eight sides
- 20. - Able to speak two languages fluently
- 21. - Three-legged stand or support
Down
- 1. - Occurring every two weeks
- 2. - Series of three related works or stories
- 4. - Group of three similar things or persons
- 5. - Three-wheeled vehicle, often for children
- 6. - Geometric shape with three sides
- 7. - Four-sided geometric shape or a courtyard
- 9. - Tenth month of the year
- 10. - Simultaneous performance or agreement
- 11. - Two-wheeled vehicle propelled by pedals
- 13. - Divide into two equal parts
- 15. - Mythical horse-like creature with a single horn
- 17. - Standard or consistent in appearance
- 18. - Vehicle with a single wheel