An agreement to put a specified amount of raw material per period through a particular processing facility. For example, an agreement to process a specified amount of alumina into aluminum at a particular aluminum plant. The New York Times Financial Glossary
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tolling agreement UK US noun [C] PRODUCTION
► a contract to supply an agreed amount of raw material to be put through industrial processes by a particular factory: »
Under an innovative tolling agreement the company has acquired rights to the total monthly output of two mines.
Financial and business terms. 2012.