• facetA grouping of concepts of the same inherent category. Examples of categories that may be used for grouping concepts into facets are: activities, disciplines, people, materials, places, etc.
  • false hitA content object retrieved whose content does not match the intent of the concepts represented by the search terms used. Previously called false drop.
  • filing rulesA set of guidelines that determine how letters and numbers, spaces, and special characters will be treated in assembling an alphabetical or other listing.
  • flat formatAn alphabetical display format of controlled vocabularies in which only one level of broader terms and one level of narrower terms are shown for each term.
  • focusIn a compound term, the noun component that identifies the class of concepts to which the term as a whole refers. Also known as head noun. See also modifier.
  • free textAntonym of controlled vocabulary. Natural language terms appearing in content objects, which can complement controlled vocabulary terms in an information storage and retrieval system. In free text searching, controlled vocabulary terms can also be retrieved. See also keyword.