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2 definitions found
 for data hierarchy
From WordNet (r) 3.0 (2006) :

  data hierarchy
      n 1: an arrangement of data consisting of sets and subsets such
           that every subset of a set is of lower rank than the set

From The Free On-line Dictionary of Computing (30 December 2018) :

  data hierarchy
  
     The system of data objects which provide the methods for
     information storage and retrieval.  Broadly, a data
     hierarchy may be considered to be either natural, which arises
     from the alphabet or syntax of the language in which the
     information is expressed, or machine, which reflects the
     facilities of the computer, both hardware and software.
  
     A natural data hierarchy might consist of bits,
     characters, words, phrases, sentences, paragraphs, and
     chapters.  One might use components bound to an application,
     such as field, record, and file, and these would ordinarily be
     further specified by having data descriptors such as name
     field, address field, etc.  On the other hand, a machine or
     software system might use bit, byte, word, block,
     partition, channel, and port.
  
     Programming languages often provide types or objects which
     can create data hierarchies of arbitrary complexity, thus
     allowing software system designers to model language
     structures described by the linguist to greater or lesser
     degree.
  
     The distinction between the natural form of data and the
     facilities provided by the machine may be obscure, because
     users force their needs into the molds provided, and
     programmers change machine designs.  As an example, the
     natural data type "character" and the machine type "byte" are
     often used interchangeably, because the latter has evolved to
     meet the need of representing the former.
  
     (1995-11-03)
  

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