What are seasons in Diablo 3?

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Tags

1. #season
2. #start
3. #opportunity
4. #earned
5. #normal
6. #optional
7. #should
8. #leveling
9. #paragon
10. #recurring
11. #seasons
12. #allows
13. #previously
14. #items
15. #materials
16. #hardcore
17. #scratch
18. #character
19. #every
20. #levels
21. #fresh
22. #without
23. #months