How does Google Analytics define a user?

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Tags

1. #technically
2. #number
3. #total
4. #audience
5. #period
6. #metric
7. #engaged
8. #which
9. #report
10. #browser
11. #unless
12. #unique
13. #instance
14. #requested
15. #anonymously
16. #defined
17. #google
18. #users
19. #identifies
20. #analytics
21. #feature
22. #client
23. #overview