CONCORDAT, in the Canon law, denotes a covenant or agreement concerning some beneficiary matter, as a relevation, permutation, promotion, or the like.
The council of Trent, sess. vi. de reform. cap. 4. speaking of concordats made without the authority
Concordat and approbation of the pope, calls them concordatus quanta tantum suos obligant auctores, non successores. And the congregation of cardinals, who have explained this decree, declares also that a concordat cannot be valid so as to bind successors, unless confirmed by the pope.