Definition of vault
1 a
:an arched structure of masonry usually forming a ceiling or roof
b
:something (such as the sky) resembling a vault
c
:an arched or dome-shaped anatomical structure
- the cranial vault
2 a
:a space covered by an arched structure;
especially
:an underground passage or room
b
:an underground storage compartment
c
:a room or compartment for the safekeeping of valuables
3 a
:a burial chamber
b
:a prefabricated container usually of metal or concrete into which a casket is placed at burial
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