Merriam-Webster's Collegiate® Dictionary, 11th Edition
VAULT
I. noun see: voluble
Date: 14th century
1. an arched structure of masonry usually forming a ceiling or roof, something (as the sky) resembling a vault, an arched or dome-shaped anatomical structure ,
2. a space covered by an arched structure, an underground storage compartment, a room or compartment for the safekeeping of valuables,
3. a burial chamber, a prefabricated container usually of metal or concrete into which a casket is placed at burial, vaulty adjective
II. transitive verb
Date: 14th century
to form or cover with or as if with a vault ; arch ,
III. verb
Etymology: Middle French volter, from Old Italian voltare, from Vulgar Latin *volvitare to turn, leap, frequentative of Latin volvere
Date: 1538
intransitive verb to leap vigorously, to do or achieve something as if by a leap , transitive verb to leap over,
IV. noun
Date: 1576
an act of vaulting ; leap