The Collaborative International Dictionary
Attic \At"tic\, a. [L. Atticus, Gr. ?.] Of or pertaining to Attica, in Greece, or to Athens, its principal city; marked by such qualities as were characteristic of the Athenians; classical; refined.
Attic base (Arch.), a peculiar form of molded base for a column or pilaster, described by Vitruvius, applied under the Roman Empire to the Ionic and Corinthian and ``Roman Doric'' orders, and imitated by the architects of the Renaissance.
Attic faith, inviolable faith.
Attic purity, special purity of language.
Attic salt, Attic wit, a poignant, delicate wit, peculiar to the Athenians.
Attic story. See Attic, n.
Attic style, a style pure and elegant.
Wikipedia
In classical architecture, the term attic refers to a story or low wall above the cornice of a classical façade. This usage originated in the 17th century from the use of Attica style pilasters as adornments on the top story's façade. The decoration of the topmost part of a building was particularly important in ancient Greek architecture and this came to be seen as typifying the Attica style. By the 18th century this meaning had been transferred to the space behind the wall of the highest story (i.e., directly under the roof), producing the modern meaning of the word " attic".
Usage examples of "attic style".
It was a fine-looking place, with white marble pillars and a porch in the Attic style.