On 7/27/2021 4:32 PM, Fabrice Couvreur via ntg-context wrote:
Hello,
How to make the macro work in the environment definition ?

not sure what you want to achieve, maybe this?

\protected\def\card#1{\m{\mfunction{Card}\thinspace#1}}

\defineenumeration
   [définition]
   [text=Définition,
    number=no,
    headcommand=\groupedcommand{}{.},
    style=italic]

\starttext

    \startdéfinition
Soit E un ensemble fini. Le cardinal de E, noté \card{E}, est le nombre d'éléments de E.

       En particulier, nous avons  \m{\card{\emptyset}=0}.
    \stopdéfinition

\stoptext



Thank you
Fabrice


\unexpanded\def\card#1{\math{\text{Card}\thinspace#1}}

\defineenumeration
    [definition]
    [text=Définition,
     number=no,
     headcommand=\groupedcommand{}{.},
     style=italic]

\starttext

  \startdefinition
   Soit E un ensemble fini. Le cardinal de E, noté \card{E}, est le nombre d'éléments de E.

    En particulier, nous avons  \m{\card{\emptyset}=0}.
  \stopdefinition

\stoptext

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