Etymology
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diner (n.)

1815, "one who dines," agent noun from dine. Meaning "railway car for eating" is 1890, American English; of restaurants built to resemble dining cars (or in some cases actual converted dining cars) from 1935. The Diner's Club credit card system dates from 1952.

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Definitions of diner

diner (n.)
a person eating a meal (especially in a restaurant);
diner (n.)
a passenger car where food is served in transit;
Synonyms: dining car / dining compartment / buffet car
diner (n.)
a restaurant that resembles a dining car;
From wordnet.princeton.edu