Glossary about Controlled Vocabularies tematres thesaurus, thesauri, information retrieval, controlled vocabularies, glossary, definitions, structured vocabularies, facets, faceted classification 1998-12-31 2011-12-13 10:39:06 en reciprocity In reference to vocabulary records, the characteristic of a two-way relationship in which both entities have mutual dependence, action, or influence on each other. Semantic relationships in controlled vocabularies must be reciprocal, meaning each relationship from one record to another must also be represented by a reciprocal relationship in the other direction. Reciprocal relationships may be symmetric (for example RT / RT) or asymmetric (for example BT / NT) 2011-08-16 23:06:52