markup

from WordNet (r) 3.0 (2006)

markup
    n 1: the amount added to the cost to determine the asking price
    2: detailed stylistic instructions for typesetting something
       that is to be printed; manual markup is usually written on
       the copy (e.g. underlining words that are to be set in
       italics)

from The Collaborative International Dictionary of English v.0.48

markup \markup\ n.
   1. (Commerce) The amount added to the cost to determine the
      asking price.
      [WordNet 1.5]

   2. (printing) Instructions for the typesetter that are
      written on the copy (e.g. underlining words that are to be
      set in italics).
      [WordNet 1.5]

   3. (Legislation) Changes in proposed legislation drafted in
      conference, as contrasted with changes resulting from the
      amendment process.
      [PJC]

from The Free On-line Dictionary of Computing (8 July 2008)

markup

   <text> In computerised document preparation, a method of
   adding information to the text indicating the logical
   components of a document, or instructions for layout of the
   text on the page or other information which can be interpreted
   by some automatic system.

   For example, the source of {this dictionary} is marked up by
   enclosing cross-references in curly braces which are
   significant to the {World-Wide Web} server software.

   (1995-03-30)