A historical information-retrieval technique that uses mathematical relationships between terms and documents.
A practical example
The term is often misused in marketing to describe related words that might naturally appear within a topic.
What to watch for
There is no useful “LSI keyword” checklist for Google rankings. Cover a subject clearly rather than inserting supposed semantic keywords.
Related reading
Explore Keyword Research and Search Intent. Try our search result preview for a practical next step. See how this fits into SEO services.