• Webster's Revised Unabridged Dictionary
    • a Aquitanian Of or pertaining to Aquitania, now called Gascony.
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Century Dictionary and Cyclopedia
    • aquitanian Pertaining to Aquitania, one of the great divisions of ancient Gaul. According to Cæsar, it was bounded by the Garonne, the Pyrenees, and the ocean. Augustus extended it as a Roman province northward to the Loire. It afterward became the Frankish and French duchy (and for some time kingdom) of Aquitaine (held as an appanage of the English crown through intermarriage for about 300 years before 1453), and finally, greatly reduced, the French province of Guienne (a medieval corruption of Aquitaine).
    • n aquitanian In geology, noting a division or stage in the Tertiary formations of the Paris basin representing the latest Oligocene. The deposits of this stage were essentially lacustrine, and the fossils are fresh-water and terrestrial mollusks, especially Helix, together with the remains of Rhinoceros and other mammals.
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In literature:

O kindly harvests of the Aquitanian grape!
"The Virginians" by William Makepeace Thackeray
Augustus divided it into three provinces, Lugdunensian (Lyonese), Belgian, and Aquitanian.
"A Popular History of France From The Earliest Times Volume I. of VI." by Francois Pierre Guillaume Guizot
The Aquitanians too became irritated.
"A Popular History of France From The Earliest Times Volume II. of VI." by Francois Pierre Guillaume Guizot
The constable of France appeared on the Aquitanian frontier.
"The History of England" by T.F. Tout
Of her kings' forays along Norman or Aquitanian borders England heard little; she cared less.
"History of the English People, Volume I (of 8)" by John Richard Green
Only the Aquitanians, south of the Loire, and the Burgundians on the Rhone, still preserved their distinct nationalities.
"The Cathedrals of Southern France" by Francis Miltoun
It seems like a cross between a basilica and an Aquitanian church.
"Sketches from the Subject and Neighbour Lands of Venice" by Edward A. Freeman