noun.
A series of columns placed at regular intervals.
noun.
A structure composed of columns placed at regular intervals.
The Century Dictionary and Cyclopedia
noun.
In architecture, any series or range of columns placed at certain intervals, called intercolumniations, from one another, such intervals varying according to the requirements of art and utility, and of the order employed.
the GNU version of the Collaborative International Dictionary of English
noun.
A series or range of columns placed at regular intervals with all the adjuncts, as entablature, stylobate, roof, etc.