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The Collaborative International Dictionary of English v.0.48 (gcide)

Portico \Por"ti*co\, n.; pl. {Porticoes}or {Porticos}. [It., L.
porticus. See {Porch}.] (Arch.)
A colonnade or covered ambulatory, especially in classical
styles of architecture; usually, a colonnade at the entrance
of a building.
[1913 Webster]


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.
[1913 Webster]

Note: When in front of a building, it is called a {portico};
when surrounding a building or an open court or square,
a {peristyle}.
[1913 Webster]