GPO, the
From Longman Dictionary of Contemporary EnglishGPO, thethe GPOGPO, the /ˌdʒiː piː ˈəʊ◂/ 1 (the General Post Office) the former name of the organization that controls mail in the UK, now called the Royal Mail2 (the Government Printing Office) a US government organization that prints government documents, maps, books etc, which it gives to national libraries and government offices, and sells to the public at low cost