superinstitution

from The Century Dictionary.

• noun In ecclesiastical law, one institution upon another; the institution of one person into a benefice into which another is already instituted.

from the GNU version of the Collaborative International Dictionary of English.

• noun One institution upon another, as when A is instituted and admitted to a benefice upon a title, and B instituted and admitted upon the presentation of another.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One institution upon another, as when A is instituted and admitted to a benefice upon a title, and B instituted and admitted upon the presentation of another.