Latent Semantic Indexing (LSI) is a system used by Google and other major search engines (Update: read here, thanks for the Tweets, guys) The contents of a webpage are crawled by a search engine and the most common words and phrases are collated and identified as the keywords for the page...

Latent semantic indexing keyword are the related keywords to the main keyword. It has the ability to expect related words when deals with a topic.

Latent Semantic Indexing (LSI) is a framework utilized by Google and other significant web search tools.The content of a website page are crawl by a search engines and the most widely recognized words and expressions are grouped and distinguished as the keyword for the page

LSI (LAtent Semantic indexing) is an indexing and retrieval method

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It means "Latent Semantic Indexing" is a system used by Google.
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LSI refers to Latent Semantic Indexing which is search engine spider can look for keywords and phrases that are similar, so a piece of high-quality content could rank for a number of similar keywords.