This dictionary of the Old Gascon language used in official documents deals with the lexis of South-Western France from the beginnings of written Gascon in the 11th century up to about 1300. The DAG is an onomasiological dictionary organising the vocabulary by subject groups. The emphasis is placed on the expressive means of medieval Gascon by bringing together all the words with related meanings. Thus apart from issues of pure word history, the dictionary also provides an insight into the structure of the lexis and thus into the linguistic and cultural history of a language domain.

From Fascicle 12 onwards the DAG is being published with a new structure for the articles, which provides more scope for semantic description and phrases. Instead of giving a multiplicity of instances, in future one selected example will be provided for purposes of contextualisation, which will enhance readability.