aquitaincommon nounadjectiveproper nounSyllable DecompositionaquitainEtymologyexpandderived from aquitain.Definition1. Ancient form of Basque and a substrate of Gascon, language spoken by the Aquitani or Proto-Basques inhabiting an area corresponding to the ancient Roman provinces of Aquitania and later Novempopulania.linguistiqueexpandFeminineaquitainePluralaquitainsTranslationsenglish:Aquitanianspanish:aquitanoSee alsoaquitain (adj.)