Is it possible to have a column with more than one term set associated?
I read that is possible to associate a MM column with a group but I don't know if I'm missing something
Edit: No , If you want to reference multiple Term SETS then you need to use multiple fields. Assign multiple term sets to a single column
If your columns say Allow the Multiple value then yes you can have more than 1 term associated it.(if you go the list settings > click on the columns then their is on check box >Multiple Value field > check it if you want)
If the column's definition allows multiple values, the user can select more than one term. If both the term set and the column's definition allow new terms to be added, the user can also create a new term and insert it at the appropriate place in the term set's hierarchy.
https://msdn.microsoft.com/en-us/library/office/ee559337(v=office.14).aspx