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According to the content of <symbol>, I would like to print it in italic followed by a comma, or not. I used the following redefinition (before \begin{document} ), but it doesn't work, the symbol (eventually empty) and the comma are always printed. Where am I wrong? The acronym definition form is ...

Thanks for your response. As I need to declare the glossary entries in the document, i.e. after \begin{document} and \printglossary , I finally use the symbol key instead of the user1 key. It's now working fine:

\documentclass{book}

%% === Acronymes ===
\usepackage{glossaries}[2012/05/21 ...

With the glossaries package, instead of having (long style):

name description.

in the glossary, I would like to use the user key user1 and display:

name user1 (in italic), description

For that purpose, I have defined my own style, but the user key user1 does not appear in the PDF. After ...