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Thesaurus-based query expansion
For each term, t, in a query, expand the query with synonyms and related words of t from the thesaurus
feline → feline cat
May weight added terms less than original query terms.
Generally increases recall
Widely used in many science/engineering fields
May significantly decrease precision, particularly with ambiguous terms.
“interest rate” “interest rate fascinate evaluate”
There is a high cost of manually producing a thesaurus
And for updating it for scientific changes
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