Why are baseball innings called innings?

Related questions

1. What's the difference between National and American League baseball?
2. How many MLB games played in history?
3. Was there a triple header in MLB?
4. How does the wild card work in MLB?
5. What subway stop is Yankee Stadium?
6. What time of year is baseball played?
7. How do MLB games work?
8. What is opening day for Major League Baseball?
9. How long is a MLB game?
10. Has there ever been a 27 strikeout baseball game?

Tags

1. #played
2. #score
3. #match
4. #batsman
5. #during
6. #cricket
7. #innings
8. #meaning
9. #takes
10. #divisions
11. #which
12. #scored
13. #example
14. #usage
15. #individual
16. #player