What does pixel mean in a camera?

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2. #produce
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4. #digital
5. #cameras
6. #phone
7. #million
8. #megapixel
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10. #phones
11. #measured
12. #reference
13. #camera
14. #resolution
15. #means
16. #refers
17. #photo
18. #image
19. #often
20. #total
21. #usually
22. #megapixels