Building a Synonymous Search Index (Thesaurus)
http://semanticstudios.com/publications/web_architect/thesaurus.html

Morville, Peter
Semantic Studios
1999

Abstract:

The value of a thesaurus stems from the inherent problems of natural language indexing and searching. Different users define the same query using different terms. Document authors, indexers, and information architects describe the same concepts using different terms.