What is LSI keyword in SEO?

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Tags

1. #indexing
2. #closely
3. #relevancy
4. #related
5. #words
6. #targeted
7. #including
8. #semantically
9. #particular
10. #keywords
11. #synonyms
12. #search
13. #phrases
14. #friendly
15. #latent
16. #primary
17. #semantic
18. #increase
19. #keyword