There is no internationally agreed standard definition of the cup, whose modern volume ranges between 200 and 250 milliliters. The amount of a cup varies for different countries and the cup is generally not used in Europe. This measurement is used only for cooking so the exact size is not that critical.
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A measuring cup is used to measure a cup.
A cup(US) is 2 gills, 8 fluid ounces, 16 tablespoons, 48 teaspoons, 236.8 ml, 1/2 pint, 1/4 quart or 1/16 gallon.
A cup (imperial) is 8 fluid ounces, 16 tablespoons, 48 teaspoons, 227 ml, 4/10 pint, 1/5 quart, 1/4 fifth, 1/20 gallon.
A large cup (imperial) is 10 fluid ounces, 1.25 small cups, 20 tablespoons, 60 teaspoons, 283.7 ml, 1/2 pint, 1/4 quart, 1/16 gallon.
A 2-cup or 4-cup glass/pyrex "liquid measuring cup" that's marked off with lines (in cups/fractions of a cup).