What do pilots mean when they say heavy?

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Tags

1. #create
2. #between
3. #tonnes
4. #traffic
5. #heavy
6. #which
7. #wings
8. #maximum
9. #radio
10. #transmissions
11. #during
12. #weight
13. #control
14. #assigned
15. #takeoff
16. #rating
17. #aircraft
18. #turbulence