Source : WordNet®

hypertext
     n : machine-readable text that is not sequential but is
         organized so that related items of information are
         connected; "Let me introduce the word hypertext to mean a
         body of written or pictorial material interconnected in
         such a complex way that it could not conveniently be
         presented or represented on paper"--Ted Nelson

Source : Free On-Line Dictionary of Computing

hypertext
     
         A term coined by Ted Nelson around 1965 for a
        collection of documents (or "nodes") containing
        cross-references or "links" which, with the aid of an
        interactive {browser} program, allow the reader to move easily
        from one document to another.
     
        The extension of hypertext to include other media - {sound},
        {graphics}, and {video} - has been termed "{hypermedia}", but
        is usually just called "hypertext", especially since the
        advent of the {World-Wide Web} and {HTML}.
     
        (2000-09-10)