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Latent Semantic Indexing (LSI)
1: An information retrieval method designed to help search engines identify the correct context of a word. LSI doesn’t play a useful role in SEO today.
See: Google Latent Semantic Indexing
FAQ
What is an LSI keyword in SEO?
An LSI keyword are terms that support and add context to the main keyword. This helps search engines better understand what the content is about.