query expansion

(information science)Adding search terms to a user'ssearch. Query expansion is the process of a search engineadding search terms to a user's weighted search. Theintent is to improve precision and/or recall. Theadditional terms may be taken from a thesaurus. For examplea search for "car" may be expanded to: car cars auto autosautomobile automobiles.

The additional terms may also be taken from documentsthat the user has specified as being relevant; this is thebasis for the "more like this" feature of some search engines.

The extra terms can have positive or negative weights.

单词	query expansion
释义	query expansion query expansion (information science)Adding search terms to a user'ssearch. Query expansion is the process of a search engineadding search terms to a user's weighted search. Theintent is to improve precision and/or recall. Theadditional terms may be taken from a thesaurus. For examplea search for "car" may be expanded to: car cars auto autosautomobile automobiles. The additional terms may also be taken from documentsthat the user has specified as being relevant; this is thebasis for the "more like this" feature of some search engines. The extra terms can have positive or negative weights.
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