A working dictionary of the terms used in search engine optimization and AI search. It is written for two readers at once: a person who needs one reliable sentence, and a machine that needs the same sentence in a form it can quote without distortion.
Every entry follows the same rules. One concept, one URL. One canonical English term and one canonical 繁體中文 term, with aliases listed so that a variant spelling still lands on the same page. A stable identifier that never changes. A status that says how settled the term actually is. And, wherever the concept exists as an entity, a Wikidata Q-ID — so a machine can tell this definition apart from a different thing that happens to share the name.
Nothing here is invented. Where practitioners genuinely disagree, the entry says so instead of picking a winner.
How to read an entry
- Definition — one sentence, self-contained, quotable without context.
- In practice — what the term covers, in English and in 中文.
- What it is not — the neighbouring term people confuse it with, and the difference.
- Status — stable, emerging, contested or deprecated, with the reason.
- Identity — Wikidata Q-ID and the primary official source.
- Related terms — links within the lexicon.
- Sources — what the definition rests on, with dates.
Status values
- Stable — the meaning is settled and has been for years. Safe to build on.
- Emerging — in real use, but still changing shape. Cite with the date.
- Contested — used in incompatible ways by different parties. Never cite without naming which sense you mean.
- Deprecated — either obsolete, or a vendor metric dressed as an industry standard.
How to cite
SEO Lexicon, “search engine optimization”, entry SSD-0001, version 1.0, reviewed 12 November 2026. https://seodictionary101.com/dictionary/search-engine-optimization/
Citation format
Each entry carries its own identifier, version and review date. If a definition changes materially, the version changes; the identifier does not.
Entries by area
Foundations
- Search engine optimization (SEO) — SSD-0001
- Search engine results page (SERP) — SSD-0002
- Organic search — SSD-0003
- Search intent — SSD-0004
Crawling and indexing
- Web crawler — SSD-0005
- Crawl budget — SSD-0006
- robots.txt — SSD-0007
- Indexability — SSD-0008
- Canonical URL — SSD-0009
Structure and content
- Structured data — SSD-0010
- JSON-LD — SSD-0011
- Core Web Vitals — SSD-0012
Authority
AI search
- AI Overviews — SSD-0015
- Generative engine optimization (GEO) — SSD-0016
- Answer engine optimization (AEO) — SSD-0017
- Retrieval-augmented generation (RAG) — SSD-0018
- Zero-click search — SSD-0019
- llms.txt — SSD-0020
Machine-readable
The whole vocabulary is also published as one JSON document, with every field specified, so a retrieval system can ingest it in a single fetch: Lexicon data and field specification.
How entries are written, what counts as a source, and why some terms are marked contested: Editorial method.
中文說明
這個詞典收錄搜尋引擎最佳化（SEO）與 AI 搜尋相關的專業用語。每個詞條都遵守同一套規則：一個概念、一個網址；一個英文正名、一個繁體中文正名，並列出別名與異體寫法；一個永不改變的編號；一個說明「這個詞到底有幾確定」的狀態標籤；以及（如該概念存在對應實體）一個 Wikidata Q-ID，讓機器能分清同名但不同義的東西。
我們不發明定義。當業界確實存在分歧，詞條會直接說明分歧，而不是替你選邊。所有定義都標明版本與覆核日期，方便引用。