A formal agreement between two parties, especially between a church and a state; specifically, an agreement between the Pope and a government
1527: when the cardinal comes back from France, he immediately begins ordering up banquets. French ambassadors are expected, to set the seal on his concordat.
An agreement made between the pope and a sovereign or government for the regulation of ecclesiastical matters with which both are concerned; as, the concordat between Pope Pius VII and Bonaparte in 1801
a signed written agreement between two or more parties (nations) to perform some action
An agreement made between a ruler and the Pope relative to the collation of benefices As the Concordat of 1801 between Napoleon Bonaparte and Pope Pius VII ; the Concordat of 1516 between Francois I and Pope Leo X to abolish the pragmatic sanction; and the Germanic Concordat of 1448 between Frederick III and Pope Nicholas V