concordat
US /kənˈkɔːr.dæt/
UK /kənˈkɔːr.dæt/

1.
concordat, accord
an agreement or treaty, especially one between the Vatican and a secular government regarding ecclesiastical matters.
:
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The government signed a new concordat with the Holy See.
Le gouvernement a signé un nouveau concordat avec le Saint-Siège.
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Historically, concordats have shaped relations between church and state.
Historiquement, les concordats ont façonné les relations entre l'Église et l'État.