n.
1) to establish, found a hospital
2) to go to hospital (BE)/to go to the hospital (AE)
3) a base; children's; city, municipal; community, non-profit; cottage (BE); evacuation; field; general; mental; military; private, proprietary (AE); state; station; teaching; veterans hospital
4) at, in a hospital (she works at/in the hospital)
5) in hospital (BE)/in the hospital (AE) (she's ill and has been in/in the hospital for a week)
USAGE NOTE: In BE, the phrases to go to hospital, to be in hospital mean 'to be hospitalized'; in AE one says to go to the hospital, to be in the hospital.