Catalog of terms and its definitions, variations, relationships of equivalence, hierarchical and associative, as well its usage. Singular, Plural, Typographic, Lexical, Syntatical, Synonymous, Quasi-Synonymous, Antonymous, Broad Term, Narrow Term, etc.

A treasury or storehouse; hence, a repository, especially of knowledge; -- often applied to a comprehensive work, like a dictionary or cyclopedia.

A work that lists terms, giving synonyms and/or antonyms for each. In database searching, it provides a standardized, controlled vocabulary for searching and organizing the database.

A controlled list of vocabulary terms which an author selects from to create a value within an element record.

a classification structure

a complex network of vertical and horizontal links, providing a mechanism for comprehensive and specific indexing and retrieval

a dangerous tool in the wrong hands

a documentary tool used in the field of information representation and retrieval that represents a field of specific knowledge through its conceptual structure