<information science> Adding search terms to a user's search.
Query expansion is the process of a search engine adding search terms to a user's weighted search.
The intent is to improve precision and/or recall.
The additional terms may be taken from a thesaurus.
For example a search for "car" may be expanded to: car cars auto autos automobile automobiles.
The additional terms may also be taken from documents that the user has specified as being relevant; this is the basis for the "more like this" feature of some search engines.
The extra terms can have positive or negative weights.
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Query By Example
Queued Sequential Access Method