[NTG-context] whitespace inside synonym

Hello, I am using the synonym mechanizm to design a glossary for my pupils. I am stuck with this: how can I insert a whitespace inside a synonym definition? What I achieved yet is: \definesynonyms [vocabulaire] [vocabulaire] [\LaDef] \starttext \vocabulaire{Unionpersonnelle}{Deux États sont en union personnelle lorsqu’ils ont le même souverain} \Unionpersonnelle\ \placelistofvocabulaire \stoptext I would like to typeset Union personnelle, without inserting a UTF-8 non breakable space. I tried {{Union personnelle}}, but don't know how may I escape the space in the macro. The answer may lay in lowlevel-macro, but I couldn't find it. Happy new year everyone! Damien Thiriet