Source : Webster's Revised Unabridged Dictionary (1913)

Colonnade \Col`on*nade"\, n. [F. colonnade, It. colonnata, fr.
   colonna column. See {Colonel}.] (Arch.)
   A series or range of columns placed at regular intervals with
   all the adjuncts, as entablature, stylobate, roof, etc.

   Note: When in front of a building, it is called a portico;
         when surrounding a building or an open court or square,
         a peristyle.

Source : WordNet®

colonnade
     n 1: structure consisting of a row of evenly spaced columns
     2: a structure composed of a series of arches supported by
        columns [syn: {arcade}]