What is deus ex machina in literature?

Related questions

1. Does Amazon Prime have ex machina?
2. Is annihilation a sequel to ex machina?
3. What does Diabolus Ex Machina mean?
4. What is the opposite of deus ex machina?
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6. Will there be a Ex Machina 2?
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10. What does deus ex machina mean in literature?

Tags

1. #object
2. #means
3. #device
4. #problem
5. #machina
6. #machine
7. #phrase
8. #unexpected
9. #solve
10. #seemingly
11. #intractable
12. #literary
13. #situation
14. #latin
15. #character
16. #adding