vault1
 
/
vɔːlt/
n.
   - a roof in the form of an arch or a series of arches, typical of churches and other large, formal buildings.
- a large room or chamber used for storage, especially an underground one. ▸a secure room in a bank in which valuables are stored. ▸a chamber beneath a church or in a graveyard used for burials. 
- Anatomy  the arched roof of a cavity, especially that of the skull.
v.
 
[
usu. as adj. vaulted]
 provide with or form into an arched roof.
Etymology
ME: from OFr. voute, based on L. volvere ‘to roll’.
vault2
 
/
vɔːlt/
v.
 leap or spring while supporting or propelling oneself with the hands or a pole.
n.
 an act of vaulting.
Derivative
Etymology
C16: from OFr. volter ‘to turn a horse, gambol’.