I. Aˌmerican Exˈpress BrE AmE ( also Amex ) trademark
a US company that has a ↑ credit card service, exchanges foreign money, and sells TRAVELLER’S CHEQUE s . It has offices all over the world, and advertisements for the American Express Card often use the phrase ‘Don’t leave home without it’.
II. Am ‧ ex /ˈæmeks/ BrE AmE trademark
abbreviation for American Express