It is possible to prevent an article altTitle to be put in the dictionary and categories by setting its "dictionary" attribute to false.
For example:
<article desc="article name"><altTitle desc="the other name" dictionary="false"/></article>
Getting rid of the dictionary
The "hasDictionary" property in the configuration file or the command-line specifies if the wiki must have a dictionary (by default a dictionary is generated).
If the propety is set to false, then the dictionary will not be generated, even if the menu item for the dictionary is explictely specified in a custom left menu.
See also
Types of files: This article explains the types of files which can be found in the wiki input