School-leaver's certificate?

• Permission for absence
• Grant of clerical leave
• Old girlfriend, perhaps, to dine and pass out
• Priest's leave
• Priest's permission to leave the diocese
• Permission to leave granted by a bishop
• Permission to leave Oxford

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Exeat \Ex"e*at\, n. [L., let him go forth.] A license for absence from a college or a religious house. [Eng.] --Shipley. A permission which a bishop grants to a priest to go out of his diocese. --Wharton.

Wiktionary Word definitions in Wiktionary
n. 1 A license or permit for absence from a college or a religious house (such as a monastery) 2 A permission which a bishop grants to a priest to go out of his diocese