Hi, This is going to be difficult to explain because the code below works but in a project with many components does not. Actually the macro does not work in the definition environment in my project but in the same environment of this simple code yes. Thank you for your possible help. Fabrice
\setupbodyfont[modern] \setupenumerations [before={}, after={\blank}, alternative=serried, number=no, title=yes, titleleft={(}, titleright={)}, prefix=yes, prefixsegments=chapter, way=bychapter, titlestyle=bold, width=broad] \defineenumeration [definition] [text=Définition, number=no, headcommand=\groupedcommand{}{}, style=slanted] \setupmathematics[stylealternative=calligraphic] \unexpanded\def\CScript#1#2{\start\switchtobodyfont[stixtwo]\m{{\mathscript{#1}}_{#2}}\stop} \unexpanded\def\cscript#1{\start\switchtobodyfont[stixtwo]\m{{\mathscript{#1}}}\stop} \starttext \startdefinition \placefigure[right]{}{ \startMPcode path rectangle; rectangle=unitsquare xscaled 6cm yscaled 4cm; draw rectangle withcolor green; label.bot("\cscript{C}", center rectangle); \stopMPcode} Soit \m{f} une fonction continue et positive sur un intervalle \m{[a\,;b]} et \cscript{C} sa courbe représentative dans un repère orthogonal. L'aire du domaine délimité par la courbe \cscript{C}, l'axe des abscisses et les droites d'équations \m{x=a} et \m{x=b}, exprimée en unité d'aire, est appelée {\bi intégrale de \m{a} à \m{b} de la fonction \m{f}}. \stopdefinition \stoptext
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