From Longman Dictionary of Contemporary EnglishWhitehallWhite‧hall /ˈwaɪthɔːl, ˌwaɪtˈhɔːl $ -hɒːl/ noun 1 PGthe British government, especially the government departments rather than parliament or the prime minister2 PGthe street in London where many of the government departments areFrom Longman Business DictionaryWhitehallWhite‧hall /ˈwaɪthɔːl, ˌwaɪtˈhɔːl-hɒːl/ noun the British government administration, especially government departments rather than Parliament