Glossary of terms relating to thesauri and other forms of structured vocabulary for information retrieval

Monohierarchical structure

hierarchical arrangement of concepts, in a thesaurus or classification scheme, in which each concept can have only one broader concept

Compare with polyhierarchical structure. In a monohierarchical structure, each concept can occur at only one place in the hierarchy and other broader term relationships have to be shown as related term relationships.

e.g. in a monohierarchical structure, the concept pianos cannot be listed as a narrower term of both keyboard instruments and stringed instruments; a choice has to be made of one of these concepts to determine its placing.