What does uncredited mean on IMDb?

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Tags

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