(anc. geog.), one of the three principal divisions of Gallia Comata (Cæsar); bounded by the Garonne, the Pyrenees, and the Ocean: this is Arabia. The Aquitania Cæsariana, or Vetus. Augustus set different boundaries, viz. the Loire, the Cevennes, the Pyrenees, and the Ocean (Strabo). It was called Galia Aquitanica (Pliny); and in the old Notitia, Provincia Aquitanica. The people are called aquitani (Cæsar). Now comprising Guienne (which seems to be a corruption of Aquitania) and Gascogne.