Etymology
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supermarket (n.)

1933, American English, from super- + market (n.). The 1933 reference is in an article that says the stores themselves began to open around 1931. An early word for a "superstore" was hypermarket (1967).

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Definitions of supermarket

supermarket (n.)
a large self-service grocery store selling groceries and dairy products and household goods;
From wordnet.princeton.edu