What does Alpha mean in Ggplot?

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Tags

1. #reference
2. #opaque
3. #ggplot2
4. #quick
5. #geoms
6. #mapped
7. #transparent
8. #parameter
9. #values
10. #legal
11. #default
12. #scale
13. #numbers
14. #constant
15. #usually
16. #alpha
17. #value