What does it mean when someone says Excelsior?

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Tags

1. #upward
2. #after
3. #excelsior
4. #wrote
5. #monthly
6. #meaning
7. #publisher
8. #marvel
9. #catchphrase
10. #comics
11. #1960s
12. #latin
13. #column
14. #which
15. #rebranded
16. #atlas
17. #motto