LSI is an older information-retrieval technique often misused in SEO as a label for ‘related keywords’; it is not a documented Google keyword list tactic.
What LSI (Latent Semantic Indexing) means
Latent Semantic Indexing is a mathematical approach associated with earlier text-retrieval research. Modern web search uses many systems and Google has not documented an ‘LSI keyword’ field, score or list that publishers can tune. Readers benefit from precise language when a topic demands it, not from mechanically injecting associated terms.
Decision rule and evidence
Write for the task, entities and distinctions a reader needs to understand. Add terminology only when it makes the explanation clearer or more accurate, and remove repeated phrases that do not carry information.
Practical workflow
- State the primary question and the concrete decision the page supports.
- Outline the necessary subtopics, examples and definitions before choosing phrases.
- Use terminology that is natural for the audience and supported by the source material.
- Review the draft for missing explanations, ambiguity and redundant repetition.
- Validate factual claims against primary documentation, not a keyword generator’s suggestion list.
Verification and common mistakes
A useful editorial review can identify whether a reader can complete the task and whether terms are explained. It cannot prove an algorithmic ‘semantic score’ or attribute a ranking change to word variation.