Glossary

AI Visibility & Machine Relations Glossary

The terms shaping how brands appear in AI-generated answers. From Machine Relations to GEO, defined by the team pioneering the category.

40 terms

Core Concepts

AI Visibility

The degree to which a brand appears in AI-generated responses across engines like ChatGPT, Perplexity, Google AI Overviews, and Gemini. The AI-era equivalent of search visibility.

Answer Engine Optimization

(AEO)

The practice of optimizing content to appear as the direct answer in AI-powered answer engines like Perplexity, Google AI Overviews, and Bing Copilot.

Citation Economy

The emerging attention system where AI engines distribute discovery and demand through citations rather than links — characterized by winner-take-most dynamics and radical concentration.

Earned Authority

Third-party credibility signals — tier-1 media placements, expert citations, independent reviews — that AI engines weight far more heavily than brand-owned content when deciding which brands to recommend.

Generative Engine Optimization

(GEO)

The practice of optimizing content and brand signals so that AI-powered search engines (ChatGPT, Perplexity, Google AI Overviews) cite, reference, and recommend your brand in generated responses. The AI-era evolution of SEO.

Machine Gatekeeper

An AI system that decides which brands, products, and sources get recommended to users — the algorithmic successor to human gatekeepers like journalists and editors.

Machine Relations

(MR)

The category-defining discipline of earning AI engine citations and recommendations — the evolution from PR (convincing journalists) to MR (convincing machines like ChatGPT, Perplexity, and Gemini to cite and recommend your brand). Coined by Jaxon Parrott; AuthorityTech is the category owner.

PR 2.0

(PR 2.0)

Shorthand for Machine Relations — the evolution of public relations from convincing human journalists to convincing AI engines to cite, recommend, and surface your brand. Where PR 1.0 targeted media gatekeepers, PR 2.0 targets machine gatekeepers.

Zero-Click PR

Earned media impact that occurs entirely within AI interfaces — brand awareness, trust, and demand generated when AI engines cite your brand in answers without the user ever clicking through to a source.

Metrics & Measurement

Technical

Strategy

Industry & Market Dynamics

Agentic Procurement

The emerging practice of AI agents autonomously evaluating, shortlisting, and selecting B2B vendors — Gartner predicts 90% of B2B purchasing will be intermediated by AI agents by 2028.

Citation Decay

The rate at which AI visibility erodes without sustained publishing — Perplexity citations decay in 2-3 days, broader AI visibility fades within weeks of publishing inactivity.

Citation Window

The narrowing period of opportunity to establish entity authority in AI engines before competitive citation patterns lock categories — closing 10x faster than prior platform shifts.

Dark Funnel

Buyer research activity occurring outside tracked channels — now predominantly in AI tools where 68% of B2B buyers begin vendor evaluation before any measurable touchpoint.

Entity Concentration

The winner-take-most dynamic in AI search where a small number of dominant brands capture a disproportionate share of AI citations — top 10 brands now capture 59.5% of category citations.

Hallucinated Citation

An AI-invented reference to a non-existent source, fabricated statistic, or misattributed claim — 31% of AI citations about B2B brands are hallucinated or materially inaccurate.

PR Agency Bifurcation

The structural split of the PR industry into traditional agencies in decline and Machine Relations-oriented agencies in growth — exemplified by Edelman's -8.1% revenue drop alongside Publicis's +4-5% gain.

Zero-Click Search

A search where the user receives a complete answer directly in the results interface without clicking through to any website — now 69% of all searches, up from 56% pre-AI.