AEO Glossary: 25 Terms Every Marketer Should Know
A short, opinionated glossary of the 25 most important Answer Engine Optimization terms — citations, retrieval, share of voice, GPTBot, and more.
Summary — A short, opinionated glossary of the 25 Answer Engine Optimization terms every marketer should know in 2026. Use it as a reference, and follow the internal links to the deeper articles in the cluster.
For the umbrella concept, start with What is AEO?.
The 25 terms
1. Answer Engine Optimization (AEO)
The practice of optimizing content, brand signals, and structured data so AI answer engines cite, recommend, or quote you. See the AEO definition guide.
2. Generative Engine Optimization (GEO)
A near-synonym for AEO, with slightly more emphasis on optimizing the generated answer itself rather than just being cited as a source. In 2026 most teams use the two interchangeably. See AEO vs SEO vs GEO.
3. Answer Engine
A consumer-facing tool that returns a synthesized natural-language answer rather than a list of links. ChatGPT, Perplexity, Claude, and Google AI Overviews are all answer engines.
4. Citation
A specific URL referenced by an answer engine in support of its answer. Citations are most visible in Perplexity and Google AI Overviews.
5. In-answer mention
A brand name appearing in the synthesized prose of an answer, regardless of whether a URL was cited. Often more valuable than a URL citation for awareness.
6. Share of voice (SOV)
Your brand's share of mentions across a defined prompt set, relative to competitors. The closest analogue to keyword rank tracking. See Measuring share of voice in AI answers.
7. Prompt set
The defined collection of buyer-relevant queries you run on a recurring schedule to measure visibility. Typically 100–500 prompts, mixed across awareness/consideration/decision stages.
8. Retrieval
The live web fetch step an answer engine performs when a query needs fresh data. Distinct from training-time knowledge.
9. Pre-trained knowledge
What the model "knows" from its training corpus, without browsing. Long-tail factual recall lives here.
10. RAG (Retrieval-Augmented Generation)
The architecture pattern where an LLM retrieves documents at query time and conditions its answer on them. Most modern answer engines are RAG-based.
11. GPTBot
OpenAI's training crawler. Allowing it in robots.txt is a prerequisite for ChatGPT training inclusion. See robots.txt for AI crawlers.
12. PerplexityBot
Perplexity's crawler, used for both indexing and live retrieval.
13. ClaudeBot
Anthropic's crawler for Claude. Paired with the anthropic-ai user agent for retrieval.
14. Google-Extended
Google's opt-out user agent for Gemini and AI Overviews training. Blocking it removes you from training; it does not affect classic search ranking.
15. JSON-LD
The recommended format for inline structured data on the web. AI engines parse JSON-LD reliably. See Schema markup for AEO.
16. Schema.org
The shared vocabulary for structured data. The AEO-relevant types are Organization, Article, FAQPage, Product/SoftwareApplication, and HowTo.
17. FAQPage schema
Structured-data markup for genuine Q&A content. High-leverage for AEO citations because LLMs prefer Q&A formats.
18. Pillar page
A long-form, definition-first page on the central category term (e.g. "What is AEO?"). The hub of a topical cluster.
19. Cluster page
A focused article that links back to a pillar page and expands on a sub-topic. Together they form a topical cluster, which signals authority.
20. Topical authority
The cumulative signal that you "own" a topic, derived from publishing depth, internal linking, and third-party citations. AI engines weight this heavily.
21. Citation graph
The network of third-party domains that mention your brand by name. The single largest off-domain authority signal for AEO. Stronger than raw backlink count.
22. Quotability
A property of content that makes it easy for an LLM to lift in 1–3 sentences. Driven by definition-first writing, short declarative sentences, and named entities.
23. Freshness
The signal an engine derives from datePublished, dateModified, visible dates, and update cadence. Especially important for Perplexity and Google AI Overviews.
24. Hallucination
When an LLM fabricates a fact. Relevant to AEO because hallucinated brand attributions can both help and hurt — and they shift over time as models retrain.
25. AI Overview
Google's generated answer that appears at the top of the SERP for many informational queries. The new "position zero." See Optimizing for Google AI Overviews.
How to use this glossary
- Bookmark it.
- Link your team's docs and Slack threads to specific terms here.
- When onboarding a new marketer, send them this page first.
What's next
Once the vocabulary is down, the next step is the tactical playbook:
The bottom line
AEO has accumulated enough vocabulary that it's worth getting precise about. Use this glossary as a shared dictionary across your team — and then do the work.
Run a free AEO scan and see how the concepts above map to your real visibility today.