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1911 Encyclopedia Britannica
Tare and Tret
In commerce, allowances or deductions. Tare is an allowance made from the gross weight of goods for the box, bag or other wrapping in which the goods are packed. It may be real, i.e. representing the actual weight of the wrapping; customary, when a uniform or established rate is allowed; average, when one or two packages among several are weighed, and the mean or average of the whole taken; or super-tare, an additional allowance when the package exceeds a certain weight. Tret is an allowance of 4 lb. in every 104 lb. of weight, made as compensation for loss by waste. "Tare" comes through the Fr. tare, cf. Sp. tara, from Arab. tarha, tarh, throwing, casting - the word meant originally loss, that which is thrown away; "tret" is an adaptation of Fr. traite, Lat. trahere, to draw, and meant a draught, transportation, also a payment on exports, an allowance on exportation.
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Chisholm, Hugh, General Editor. Entry for 'Tare and Tret'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/t/tare-and-tret.html. 1910.