From Longman Dictionary of Contemporary EnglishGirobankGi‧ro‧bank /ˈdʒaɪərəʊbæŋk/ the former name of a British bank, now called the Alliance & Leicester Commercial Bank, which operates through local post offices in the UKFrom Longman Business DictionaryGirobankGi‧ro‧bank /ˈdʒaɪrəʊbæŋk-roʊ-/ nounBANKINGORGANIZATIONS a former bank in Britain where customers could use post offices to put money into and take money out of their account, to pay bills etc