Oxford Dictionary English investment bank nounnoun BrE BrE//ɪnˈvestmənt bæŋk// ; NAmE NAmE//ɪnˈvestmənt bæŋk// (British English also merchant bank) Add to my wordlistjump to other resultsa bank that deals with large businessesSee investment bank in the Oxford Advanced American DictionaryCheck pronunciation: investment bank oxfordlearnersdictionaries.com