1. a vehicle that takes people to and from hospitals;
The Collaborative International Dictionary of English v.0.48:
Ambulance \Am"bu*lance\, n. [F. ambulance, h[^o]pital ambulant,
fr. L. ambulare to walk. See Amble.] (Mil.)
(a) A field hospital, so organized as to follow an army in
its movements, and intended to succor the wounded as soon
as possible. Often used adjectively; as, an ambulance
wagon; ambulance stretcher; ambulance corps.
(b) An ambulance wagon or cart for conveying the wounded from
the field, or to a hospital.
WordNet (r) 3.0 (2006):
n 1: a vehicle that takes people to and from hospitals