• mappingA set of correspondences between categories, schema element names, or controlled terms. Mappings are used for transforming data or queries from one vocabulary for use with another.
  • metasearchingThe simultaneous searching across multiple databases, sources, platforms, and protocols. Also known as broadcast searching, cross-database searching, federated searching, or parallel searching.
  • microcontrolled vocabularyA subset of a controlled vocabulary, covering a limited range of topics within the domain of the controlled vocabulary. A microcontrolled vocabulary may contain highly specialized terms that are not in the broad controlled vocabulary. Such terms should map to the hierarchical structure of the ...
  • modifierIn a compound term, one or more components that serve to narrow the extension of a focus and specify one of its subclasses. Also known as difference.
  • multilevel hierarchyA set of hierarchical relationships among terms that has multiple levels of specificity extending from the most broadly defined terms to the most specific.