a collection of terms arranged in a treelike hierarchy (a directed acyclic graph) to represent groupings, sub-groupings, sub-sub-groupings, and so on

a controlled vocabulary that is designed to populate the NASA metadata core specification

a hierarchy of subject matter from the general to the specific

a set of terms that are arranged into a generalization-specialization hierarchy

a thesaurus with a science orientation

a type of CV, consisting of preferred terms, all of which are connected in a hierarchy or a polyhierarchy

controlled vocabulary used primarily for the creation of navigation structures for websites. Often based on a thesaurus, but may have shallower hierarchies and less structure, for example, no related terms.

The science of arranging organisms into groups, based on how closely they are related.

Overall scheme for organizing content to solve a business problem such as improving search, browsing for content on an enterprise-wide portal, enabling business users to syndicate content, and otherwise providing the basis for content re-use. The basic idea behind taxonomy is to provide a controlled vocabulary for metadata attributes, and to specify relationships between terms in the controlled vocabulary. The simplest relationships are broader, narrower, and related, but relationships can be much more specific and complex. UNSPSC Taxonomy example Prepared and preserved foods Broader term Snack food Corn chips Narrower term Popcorn Narrower term Potato chips Narrower term Pretzels Narrower term Beer Related term

A type of facet in which the headings are arranged into a hierarchy. This is the most broadly useful type of facet, since thousands of headings can be organized into a presentable selection.

Thesaurus Title index

"A vocabulary ordered into a hierarchy, generally to find terms easily, and also to subtype the terms."