noun.
A platform at the entrance of a large building.
noun.
A flight of steps leading to such a platform.
The Century Dictionary and Cyclopedia
noun.
In architecture, an external flight of steps by which access is given to the entrance-door of a building when the principal floor is raised above the level of the ground. It is often so treated as to form an important architectural adornment.
the GNU version of the Collaborative International Dictionary of English
noun.
An out-of-door flight of steps, as in a garden, leading to a terrace or to an upper story; -- usually applied to mediævel or later structures of some architectural pretensions.