1 [uncountable and countable]
when a factory, school, hospital etc has to close permanently:
Several military bases are threatened with closure.
factory/hospital/school etc closure
the problem of school closures
the closure of St Bartholomew's Hospital
2 [uncountable and countable]
when a road, bridge etc is closed for a short time so that people cannot use it:
On the M40, there are lane closures near Oxford.
when an event or a period of time is brought to an end, or the feeling that something has been completely dealt with:
Funerals help give people a sense of closure.