noun.
An underbuilding; a mass of building below another; a foundation.
the GNU version of the Collaborative International Dictionary of English
noun.
Underbuilding; the foundation, or any preliminary structure intended to raise the lower floor or basement of a building above the natural level of the ground.
noun.underbuilding; the foundation, or any preliminarystructure intended to raise the lower floor or basement of a building above the natural level of the ground
Word Usage
"Persepolis, raised, for the substruction of their palaces, an immense platform of massive masonry, which is one of the most wonderful monuments of the world's ancient builders."