An archaic or obsolete term for the cost of transporting goods or the charges associated with handling cargo.
Middle English from Old French costage, derived from cost (expense) plus -age (suffix indicating action or process), common in medieval commerce terminology.
Medieval merchants needed a word for shipping fees, so they stuck -age on 'cost' to make 'costage'—it's the same suffix we use today in words like 'baggage' and 'luggage,' showing how merchants invented business vocabulary.
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