What does uncredited on IMDb mean?

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Tags

1. #unbilled
2. #appear
3. #their
4. #screen
5. #words
6. #example
7. #uncredited
8. #means
9. #famous
10. #credit
11. #appearance
12. #cameo
13. #typical
14. #person
15. #receive
16. #other
17. #titles
18. #actor