What does the A in RGBA stand for?

Related questions

1. Why is 255 the MAX IP?
2. Why is magenta cyan yellow?
3. What is alpha masking?
4. Is transparent a color?
5. What is alpha channel used for?
6. What is Alpha in images?
7. What color is close to white?
8. What does an alpha channel do?
9. What color is Rgba?
10. What is alpha channel image?

Tags

1. #desired
2. #composed
3. #actually
4. #already
5. #green
6. #amounts
7. #channel
8. #opacity
9. #alpha
10. #various
11. #define
12. #color
13. #specify
14. #final
15. #stands
16. #colors