colonnade

Row of columns generally supporting an entablature, used either as an independent feature (e.g., a covered walkway) or as part of a building (e.g., a portico). The earliest colonnades appear in the temple architecture of ancient Greece. In a basilica, colonnades are used to separate the side aisles from the central space. See also stoa.

Find more information on colonnade. Upgrade to Britannica Online for more on colonnade.