The definition of a tret is an allowance for waste during transportation.
An example of a tret is a reduction to the purchaser in the total cost of water-based fluid shipped as a way to make up for weight lost due to evaporation during shipment.
a fixed allowance by weight, after the deduction of tare, formerly made to buyers of certain commodities to compensate for waste and deterioration during transit
Origin of tretAnglo-French (Fr trait), a pull from Old French traire ( from Classical Latin trahere, to draw)
- (Yorkshire, colloquial) Simple past tense and past participle of treat.