Using the “semicolon” key with a space before it does not work. Remove the space and it does. \starttext \setupmathematics[autopunctuation={all, semicolon}] \m{a;b}\quad \m{a,b}\quad\m{a.b}\quad\m{1;11}\quad \m{1,11}\quad\m{1.11} \setupmathematics[autopunctuation={all,semicolon}] \m{a;b}\quad \m{a,b}\quad\m{a.b}\quad\m{1;11}\quad \m{1,11}\quad\m{1.11} \stoptext Alan