Definition of vault:
(n) :
an arched structure of
masonry, forming a
ceiling or
canopy; a structure resembling a vault, especially (poetic) that formed by the sky
"1985, God said, 'Let there be a vault through the middle of the waters to divide the waters in two.' -- Genesis 1:6 (New Jerusalem Bible)"
(v) :
to jump or leap over (something)