How Google Updates Affect Reference and Dictionary Sites

Dictionaries, encyclopedias, lyric databases, unit converters, quotation sites and unofficial wikis were once among the steadiest traffic earners on the web. Their content answers short, frequent questions, and for years that meant reliable top rankings. Since 2022, though, reference publishers have faced two pressures at once: core updates that appeared to favour other kinds of results, and AI features that answer simple questions without a click.

This guide looks at what is confirmed about Google's treatment of reference content, what analysts reported after the May 2022 core update, and how AI Overviews and AI Mode change the picture in 2026. We then set out a practical plan for reference sites.

Background on core updates in general is in our guide to Google core updates.

Key Takeaways

• Google confirmed the May 2022 core update (25 May - 9 June 2022) but never named winners or losers.
• Third-party analysis summarised by Search Engine Journal reported dictionaries, Wikipedia knock-offs, lyrics and stock photo sites among the losers.
• AI Overviews (US from May 2024) and AI Mode (US from May 2025) answer many definition-style queries directly.
• The Wikimedia Foundation reported about an 8% drop in human pageviews for March-August 2025 versus 2024.
• Depth, provenance and tools are what reference sites can offer that a one-line answer cannot.

The May 2022 core update and reference sites

Google's dashboard records the May 2022 core update as released on 25 May 2022 and complete on 9 June 2022, with no detail on which sites were affected, as is normal for core updates. The sector findings come from analysts. Search Engine Journal pulled together several data sources and reported:

“References websites – including dictionaries, Wikipedia-knockoffs, lyrics, and stock photo sites – were among the losers.”

— Search Engine Journal, Google May 2022 core update impact

In the same piece, Malte Landwehr (then at Searchmetrics) described such pages as "backfill" that "rarely match the search intent", and the article itself called its analysis "a hypothesis; an educated guess based on publicly available data". That caution matters: these are observations, not Google statements. Our archived write-up of the May 2022 broad core update has more context, and our colleagues explain how search intent shifts during core updates.

Timeline of changes that affect reference content

Change	Date	Confirmed?	Effect on reference sites
Panda	Feb 2011 (US)	Yes	Site-quality assessment; thin, repetitive pages at risk. Now part of core ranking.
Featured snippet deduplication	22 Jan 2020	Yes	A page in a featured snippet no longer repeated as a regular page-one listing.
May 2022 core update	25 May - 9 Jun 2022	Yes	Analysts reported reference sites among losers and video sites among winners.
Helpful content system	Aug 2022; part of core from Mar 2024	Yes	Rewards original, people-first content over summaries.
AI Overviews	US from 14 May 2024	Yes	Generative summaries above results; 200+ countries and 40+ languages by May 2025.
AI Mode	US from 20 May 2025	Yes	Conversational AI results experience.

Sources: Google Search Status Dashboard, Wikipedia (Timeline of Google Search; AI Overviews) and Google's ranking systems guide. Our AI search rollout timeline tracks every AI feature launch, and our post on featured snippet deduplication explains that change.

AI answers and the reference model

Reference content is, almost by definition, what AI summaries are good at. The Wikimedia Foundation's Marshall Miller, as reported by Computing in October 2025, said human pageviews fell by about 8% between March and August 2025 compared with the same period in 2024, and gave this explanation among others:

“Search engines are increasingly using generative AI to provide answers directly to searchers”

— Marshall Miller, Wikimedia Foundation, quoted by Computing, Wikipedia reports traffic drop, blames AI search and social media

He also pointed to younger users turning to video platforms and to improved bot detection that revealed the true decline. Google's position is that there are no special requirements to appear in AI features: a page must be "indexed and eligible to be shown in Google Search with a snippet". That makes the strategic choice clear. Reference sites should aim to be the cited source behind AI answers and to offer what a summary leaves out. Our AI Overviews SEO guide and zero-click searches guide go further.

A step-by-step plan for reference sites

1. Split queries by type: quick definitions, deeper explanations, navigational, tools.
2. Measure CTR and position separately for each type; read AI Overviews CTR vs ranking loss.
3. Audit thin entries: one-line definitions, auto-generated pages, duplicated lyric or quote pages.
4. Add depth: usage examples, etymology, audio, related terms, sources and editorial notes.
5. Show provenance: editorial policy, named editors, update dates and citations.
6. Build tools and data users return to: converters, quizzes, datasets, comparison tables.
7. Reduce reliance on Google with newsletters, apps and direct visits.

Reference page type	Pressure	Durable value to add
Single-word definition	Answered in AI features	Examples, usage notes, pronunciation, synonyms with nuance
Lyrics / quotes	Licensing and duplication	Licensed content, verified attribution, context
Encyclopedic article	Overlap with Wikipedia and AI	Original research, expert authorship, media
Converters / calculators	Built-in Google tools	Advanced options, explanations, saved history

For a page-by-page approach, see our colleagues' content quality audit after a core update.

Common mistakes

• Treating a CTR fall as a penalty and rewriting pages that still rank well.
• Bulk-generating definition pages with AI to win back traffic.
• Copying lyrics or quotes without licences or attribution.
• Removing editorial bylines and dates, which weakens trust signals.
• Assuming the May 2022 analyst findings are permanent or official.

Reference publishers share many challenges with education sites; see how Google updates affect education sites.

Related Guides

• Video in Google Search: How Updates Changed Visibility for Video Creators
• How Google Updates Affect Media, Entertainment and Streaming Sites
• The Florida Update (2003): The Shake-Up That Ended Old-School SEO

Frequently Asked Questions

Did Google confirm that the May 2022 core update targeted reference sites?

No. Google confirmed the May 2022 core update and its dates (25 May to 9 June 2022) but did not name winners or losers. Reports that dictionaries, lyrics and stock photo sites lost visibility come from third-party analysis summarised by Search Engine Journal.

Are AI Overviews replacing dictionary and definition sites?

They answer many simple definition queries directly, which can reduce clicks even when rankings hold. The Wikimedia Foundation reported roughly an 8% fall in human pageviews between March and August 2025 compared with the year before and cited generative AI answers in search as one factor.

What can a reference site do that an AI answer cannot?

Offer depth and provenance: etymology, usage examples, pronunciation audio, citations, editorial standards, historical data and tools. These give users a reason to click and give AI features something worth citing.

Should reference sites block AI features with nosnippet?

That is a business decision. Google's AI features documentation explains that preview controls such as nosnippet and max-snippet limit what can be shown, but they also limit how your content appears in regular snippets.

How do I tell CTR loss from a ranking drop?

In Search Console, compare average position with click-through rate for the same queries. Stable positions with falling CTR usually point to changes in the results page rather than a demotion.

Conclusion

Reference sites are not doomed, but the easy traffic from one-line answers is shrinking. Separate CTR loss from ranking loss, deepen your best entries, prove provenance and build tools people return to. For a tailored review, request a quote.

References

1. Google Search Status Dashboard: May 2022 core update
2. Search Engine Journal: Google May 2022 core update impact
3. Wikipedia: Timeline of Google Search
4. Wikipedia: AI Overviews
5. Computing: Wikipedia reports traffic drop, blames AI search and social media
6. Google Search Central: AI features and your website
7. Google Search Central: A guide to Google Search ranking systems