Concordat

n.	1.	A compact, covenant, or agreement concerning anything.
	2.	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.

Noun

1.

concordat - a signed written agreement between two or more parties (nations) to perform some action Synonyms: covenant, compact

compact, covenant, Lateran Treaty, written agreement