What MMO means in games?

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Tags

1. #players
2. #commonly
3. #feature
4. #persistent
5. #hundreds
6. #thousands
7. #games
8. #usually
9. #numbers
10. #typically
11. #online
12. #server
13. #massively
14. #multiplayer
15. #large
16. #although
17. #world
18. #differ