The amount of liquid or substance that a cup can hold, typically about 8 fluid ounces.
From Old English 'cuppe' (cup) + 'full' (full amount). The compound formed to measure quantities by cup in cooking and daily life, becoming standardized in measurements.
A 'cupful' is technically ambiguous—it's 8 oz in cooking, but a coffee cup holds different amounts than a teacup, which is why recipes often confused people for centuries until metric measurements took over!
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