> ## Documentation Index
> Fetch the complete documentation index at: https://wiki.platelunchcollective.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Co-Citation

> Co-citation occurs when two entities or sources are mentioned together across multiple independent documents, establishing an implied relationship between them.

*Core concept* · *Entity & Knowledge Graph*

## Definition

Co-citation occurs when two entities or sources are mentioned together across multiple independent documents, establishing an implied relationship between them. AI systems use co-citation patterns as evidence of topical association and mutual authority.

## Why It Matters for AI Search

Co-citation is how AI systems build their map of who is associated with what. A brand consistently mentioned alongside recognized industry authorities — in articles, roundups, and comparisons — accumulates topical association that is difficult to manufacture directly. It is also how AI systems learn what a brand does: being co-cited with "[AI SEO](https://www.platelunchcollective.com/services/ai-seo)" and "entity optimization" repeatedly across independent sources builds the system's confidence that those are genuinely what the brand is about.

## Related Terms

<CardGroup cols={2}>
  <Card title="Entity salience" href="/ai-search-glossary/entity-salience" />

  <Card title="Brand mention" href="/ai-search-glossary/brand-mention" />

  <Card title="Unlinked brand mention" href="/ai-search-glossary/unlinked-brand-mention" />

  <Card title="Citation signal" href="/ai-search-glossary/citation-signal" />

  <Card title="Topical authority" href="/ai-search-glossary/topical-authority" />
</CardGroup>

## Relevant Plate Lunch Collective Services

[Entity SEO](https://www.platelunchcollective.com/services/entity-seo)  [Citation-Ready Content](https://www.platelunchcollective.com/services/citation-ready-content)  [Context Map](https://www.platelunchcollective.com/services/context-map)