Definition of American Express™ from the Oxford Advanced Learner's Dictionary

 

American Express™

 
BrE
 
; NAmE
 
(abbreviation AmEx)
 
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an international US company best known for its credit cards, charge cards and formerly for its traveller's cheques (= cheques for various fixed amounts which can be exchanged for cash in foreign countries). Established in 1850, the company also now offers many financial services.