clas·si·fi·ca·tion /ˌklæsəfəˈkeʃən/
  分類,分級;分類法
  classification
  等級 分類
  Clas·si·fi·ca·tion n.  The act of forming into a class or classes; a distribution into groups, as classes, orders, families, etc., according to some common relations or affinities.
  Artificial classification. Science See under Artifitial.
  ◄ ►
  classification
       n 1: the act of distributing things into classes or categories of
            the same type [syn: categorization, categorisation,
            compartmentalization, compartmentalisation, assortment]
       2: a group of people or things arranged by class or category
          [syn: categorization, categorisation]
       3: the basic cognitive process of arranging into classes or
          categories [syn: categorization, categorisation, sorting]
       4: restriction imposed by the government on documents or
          weapons that are available only to certain authorized
          people [ant: declassification]