In classical architecture, a colonnade is a long sequence of columns joined by their entablature, often free-standing, or part of a building.
In St. Peter's Square in Rome, Bernini's great colonnade encloses a vast open elliptical space.
A portico may be more than one rank of columns deep, as at the Pantheon in Rome or the stoae of Ancient Greece.
αραιος, "widely spaced", and συστυλος, "with columns set close together"), as in the case of the western porch of St Paul's Cathedral and the east front of the Louvre.
The porch of columns that surrounds the Lincoln Memorial in Washington, D.C., (in style a peripteral classical temple) can be termed a colonnade.