Topical authority · Thematic authority
Topical authority is the recognition of a site as a reference on a subject, built through exhaustive, consistent coverage rather than isolated pages. The concept, popularized by SEO practitioners, is not an official Google metric.
Standalone definition · 35 words
How is topical authority built?
Through a set of pages that cover a subject in breadth (definitions, comparisons, use cases, objections) and depth (data, methods, cases), linked by clear internal linking around pillar pages. A single page, however good, is not enough to signal expertise on a domain.
Why does topical authority matter for GEO?
AI engines break a question into sub-questions (query fan-out). A site covering several angles of a subject is more likely to provide passages for several sub-queries. Thematic consistency also strengthens the brand’s identification as a source in that field.
How do you measure it?
There is no official score. Practitioners look at the coverage rate of a topical map, the share of the subject’s queries where the site ranks, AI citations over a set of prompts for the domain and changes in share of voice. Document it with a stable method.
Frequently asked questions
Does Google talk about topical authority?
Google talks about expertise and trustworthiness in its guidance, not a topical authority score. The term comes from the SEO community.
How many pages do I need?
There is no official number. Start from a topical map built from real queries and sub-queries.
Should I delete off-topic pages?
Not systematically. Mainly avoid weak or redundant content that dilutes the subject.
Related terms
Further reading
- RRF, Reciprocal ranking fusion tech class the answers on the LLMs (Chatgpt, Gemini)
- Checklist GEO and LLM / AI 2026
- ← Back to the GEO glossary (114 terms)