Free reference · Schema-first · Solo-built
Every term in AI search, defined and citation-tracked.
Plain-English definitions of GEO, AEO, AIO, LLMO, DefinedTerm schema, sub-document retrieval, and the rest of the 2026 AI-search vocabulary. Each entry is paired with live data on whether ChatGPT, Perplexity, Claude, and Copilot actually cite it.
- Terms shipped
- 43
- With AI citation
- 0
- Engines tracked
- 5
Why this exists
AI search engines cite content with proper schema markup. But the vocabulary itself (what GEO actually means, how it differs from AEO, which schema types AI Overview prefers) has been scattered across SEO blogs, Twitter threads, and outdated vendor definitions.
GEO Glossary is the canonical reference: every term shipped as a DefinedTerm JSON-LD record, hand-edited, with a per-engine citation tracker updated weekly. No popups. No lead-magnet gates. No ads.