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The term "Gran Buenos Aires" ("Greater Buenos Aires") was first officially used in 1948, when Governor of Buenos Aires Province Domingo Mercante signed a bill delineating as such an area covering 14 municipalities surrounding the City of Buenos Aires. The term is also related to other expressions that are not necessarily well-defined: the "Buenos Aires' conurbation" ("Conurbano Bonaerense"), the "Greater Buenos Aires Agglomeration" ("Aglomerado Gran Buenos Aires"), and the "Metropolitan Area of Buenos Aires" ("Área Metropolitana Buenos Aires", AMBA).