The amount or quantity of liquid that a barrel or multiple barrels can hold; also the fee charged for storing goods in barrels.
From barrel + -age (a suffix meaning quantity, collection, or fee). This commercial term emerged in medieval trading to standardize measurements and storage charges.
Barrelage fees were crucial to medieval economies—they standardized how much wine, beer, or ale merchants could store, and how much they'd pay for the privilege, making trade more predictable.
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