How second is defined?

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Tags

1. #there
2. #abbreviation
3. #expressions
4. #produced
5. #192631770
6. #elapses
7. #standard
8. #cesium
9. #between
10. #second
11. #levels
12. #international
13. #cycles
14. #transition
15. #radiation
16. #during
17. #other