Other forms: groceries
A grocery is a shop that sells food, and the plural is the food you buy there. Bread, milk, tins, and a bag that splits on the way home.
American English uses it most, where the grocery store is the everyday shop and groceries is the weekly shopping. British English says supermarket or the shops, and grocer for the person. The word came from gross, meaning to sell in bulk, which is what a grocer originally did. Grocery shopping and a grocery list are standard phrases on both sides.
Middle English
grocerye
English, today
grocery
From Middle English grocerye, equivalent to grocer + y. Compare gross. a doublet of groceria.
Etymology from Wiktionary, CC BY-SA