Abbreviation for "American Viticultural Area" (in some sources also "Approved Viticultural Area"), in the USA common appellation system. It was actually introduced at the urging of especially the Californian grape farmers. Because in the 1940s in California developed classification system according to climatic zones had proved to be ineffective. From the year 1970, all US states were in terms of their geographical characteristics according to the order of the US Federal Government of the former authority BATF (today TTB Alcohol and Tobacco Tax and Trade Bureau). This was, for example, the suitability of certain regions for a particular grape variety. In 1978, for the first time, some geographical areas were classified and thus the conditions for a Origin system after the French Appellation d'Origine Protégée created.