Definition:
Attica is the name of the region of a southeast promontory of central Greece. It's prominent in ancient Greek history because Athens is its main city.
Attica has four mountain systems, Aegaleus, Hymettus, Pentelicus, and Laurium. Attica was the source of the famous white Pantelic marble and grey, blue, and black marble from Hymettus. In Laurium were silver and lead mines. Under Peisistratus and then Cleisthenes all the tribes of Attica were brought under a centralized government in Athens.
References:
"Attica" The Concise Oxford Companion to Classical Literature. Ed. M.C. Howatson and Ian Chilvers. Oxford University Press, 1996.
Examples:
Attic is an adjective based on the place name Attica. Attic refers to the prestigious dialect of Greek found in Attica.