DefinedTerm Schema

DefinedTerm is a Schema.org type for describing a term and its definition as structured data. Paired with DefinedTermSet, which groups terms into a glossary or controlled vocabulary, it lets a publisher state unambiguously: this string is a term, this text is its definition, and it belongs to this collection.

The value for AI search is disambiguation. Definitional prompts are extremely common, and models answering them must decide which source states a concept most authoritatively. Unstructured prose leaves the boundary between term and definition to be inferred; DefinedTerm markup removes the inference. It also helps with terms whose meaning is contested or overloaded, where an explicit definition attached to an identified entity is easier to trust than a paragraph that mentions the phrase.

A useful pattern is to combine DefinedTerm with FAQPage markup on the same glossary entry, and to give each term its own indexable URL rather than burying dozens on one long page. Individual URLs give each term its own entity footprint, its own citation target, and its own place in a topical map—and they play directly to sub-document retrieval, since a focused definition page is naturally one clean retrievable passage.

DefinedTerm is not a ranking trick. It will not make a weak definition authoritative, and structured data does not substitute for accuracy or originality. What it does is remove ambiguity for the systems deciding which definition to cite, which is a meaningful edge in a query class where precision is the entire product.