A Vault

1. An arched masonry structure supporting and forming a ceiling, whether freestanding or forming part of a larger building.
2. The decoration of the vault of Sainte-Chapelle was much brighter before its 19th-century restoration.
3. Any arched ceiling or roof.
4. (figuratively) Anything resembling such a downward-facing concave structure, particularly the sky and caves.
5. The space covered by an arched roof, particularly underground rooms and (Christianity, obsolete) church crypts.
6. Any cellar or underground storeroom.
7. Any burial chamber, particularly those underground.
8. The secure room or rooms in or below a bank used to store currency and other valuables; similar rooms in other settings.
9. (gymnastics) A piece of apparatus used for performing jumps.
10. (gymnastics) A gymnastic movement performed on this apparatus.
11. (computing) An encrypted digital archive.
12. (obsolete) An underground or covered conduit for water or waste; a drain; a sewer.
13. (obsolete) An underground or covered reservoir for water or waste; a cistern; a cesspit.
14. (obsolete, euphemistic) A room employing a cesspit or sewer: an outhouse; a lavatory.

(outhouse or lavatory): bathroom

(gymnastic apparatus): vaulting table