(1):

(n.) A long, arched building or gallery.

(2):

(n.) An arched or covered passageway or avenue.

(3):

(n.) A series of arches with the columns or piers which support them, the spandrels above, and other necessary appurtenances; sometimes open, serving as an entrance or to give light; sometimes closed at the back (as in the cut) and forming a decorative feature.