The Collaborative International Dictionary of English v.0.48:

Atticize \At"ti*cize\, v. t. [Gr. ?.]
   To conform or make conformable to the language, customs,
   etc., of Attica.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Atticize \At"ti*cize\, v. i.
   1. To side with the Athenians.
      [1913 Webster]

   2. To use the Attic idiom or style; to conform to the customs
      or modes of thought of the Athenians.
      [1913 Webster]