• recallA measure of a search system's ability to retrieve all relevant content objects. Usually expressed as a percentage calculated by dividing the number of retrieved relevant content objects by the number of all relevant content objects in a collection. A high recall search retrieves a comprehensive ...
  • reciprocitySemantic relationships in controlled vocabularies must be reciprocal, that is each relationship from one term to another must also be represented by a reciprocal relationship in the other direction. Reciprocal relationships may be symmetric, e.g. RT / RT, or asymmetric e.g. BT / NT. See also ...
  • relaciĆ³n de equivalencia
  • related termA term that is associatively but not hierarchically linked to another term in a controlled vocabulary. In thesauri, the relationship indicator for this type of term is RT.
  • relationship indicatorA word, phrase, abbreviation, or symbol used in thesauri to identify a semantic relationship between terms. Examples of relationship indicators are UF (USED FOR), and RT (related term).
  • romanizationThe conversion of a non-roman script by means of transcription or transliteration or a combination of the two methods.
  • running headA page heading indicating the first and last entries that appear on that page. The heading changes on each page to reflect the changed content.