Exeat
/ˈeksɪæt/
Definition 1 of 1
Pro Tip 1/3Cultural Specificity
Exeat is mainly used in British English, less commonly understood in other English-speaking regions. 
When I studied in the UK, I needed an exeat to leave campus.
Pro Tip 2/3Formal Permission
Exeat is a formal permission, not just casual spoken consent. 
The headmaster provided a written exeat for her to go home.
Pro Tip 3/3Temporary Leave
An exeat is granted for a specific, limited period, not for indefinite leave. 
His exeat allowed him to leave the monastery for two days.