Attributive Designating a charge card issued by the American Express company. Also absol.: such a card as a means of payment.
In recent use also occasionally referring to a credit card issued by this company.
American Express/əˌmɛrɪk(ə)n ɪkˈsprɛs/ /əˌmɛrɪk(ə)n ɛkˈsprɛs/
1950s; earliest use found in The Bridgeport Telegram. From the name of the American ExpressCo., provider of the credit and charge cards.