refining
/rɪˈfaɪnɪŋ/ noun [U] PRODUCTIONDefinition
› the process of making different products from a basic product, usually oil or sugar: oil/gas refining Zambia is among the top five nations in terms of reserves, refining capacity, and production of copper.
(Definition of refining noun from the Cambridge Business English Dictionary
© Cambridge University Press)
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