noun (n)

• calling out the name of a person (especially by a loudspeaker system)(noun.communication)

  Example:
  The public address system in the hospital was used for paging.
  

  source: wordnet30
• the system of numbering pages(noun.communication)

  Synonym:
  folio, page number, pagination
  

  source: wordnet30
• The marking or numbering of the pages of a book.(noun)

  source: webster1913