Source : Free On-Line Dictionary of Computing

comment out
     
         To surround a section of code with {comment}
        {delimiters} or to prefix every line in the section with a
        comment marker.  This prevents it from being compiled or
        interpreted.  It is often done to temporarily disable the
        code, e.g. during {debugging} or when the code is redundant or
        obsolete, but is being left in the source to make the intent
        of the active code clearer.
     
        The word "comment" is sometimes replaced with whatever
        {syntax} is used to mark comments in the language in question,
        e.g. "hash out" ({shell script}, {Perl}), "REM out" ({BASIC}),
        etc.
     
        Compare {condition out}.
     
        [{Jargon File}]
     
        (1998-04-28)