Source : WordNet®

data structure
     n : (computer science) the organization of data (and its storage
         allocations in a computer)

Source : Free On-Line Dictionary of Computing

data structure
     
         Any method of organising a collection of
        {data} to allow it to be manipulated effectively.  It may
        include {meta} data to describe the properties of the
        structure.
     
        Examples data structures are: {array}, {dictionary}, {graph},
        {hash}, {heap}, {linked list}, {matrix}, {object}, {queue},
        {ring}, {stack}, {tree}, {vector}.
     
        (2003-09-11)