• A representation of the relationships among words and their meanings that is richer than a Taxonomy. For example, an Ontology can represent the fact that a wheel is a part of a bicycle, that gold is yellow, and so on. 1
  • A categorical or conceptual structure that may not be strictly hierarchical (cf. taxonomy). Concepts can be related to one another in complex ways. For example, an ontology may represent that lawyers, paralegals, and judges are associated with one another (one is not strictly a subset of the other). 2


  1. Maura R. Grossman and Gordon V. Cormack, EDRM page & The Grossman-Cormack Glossary of Technology-Assisted Review, with Foreword by John M. Facciola, U.S. Magistrate Judge2013 Fed. Cts. L. Rev. 7 (January 2013).
  2. Herb Roitblat, Search 2020: The Glossary.
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