A feudal payment or rent paid in crops or a share of the harvest, particularly common in medieval France.
From Old French 'champart' meaning field-sharing, from 'champ' (field) and 'part' (share). This medieval term reflects the agricultural economy where peasants paid landlords with portions of their crops.
Champart was basically the medieval equivalent of a property tax, except instead of paying money, farmers literally had to give their landlord a percentage of their wheat, beans, or whatever they grew—talk about early agricultural economics!
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