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/ɹiˈdɑk.ʃən/ · re·duc·tion
noun
  1. The act, process, or result of making something smaller or less in amount, size, or degree. The reduction of the budget forced the department to cut several programs.
  2. The amount or rate by which something is reduced, especially in price or quantity. A 5% reduction in robberies was reported after the new patrol schedule was implemented.
  3. In chemistry, a reaction in which a substance gains electrons, decreasing its oxidation state, often by the removal of oxygen or addition of hydrogen. During the experiment, the metal ion underwent reduction, gaining two electrons.
Did you know? The culinary term ‘reduction’ refers to simmering a liquid to evaporate water and concentrate flavors, a technique famously used by French chefs in the 19th century.
Written by Lexi Wordsworth, Dictionary Editor 0 lookups Added Jul 14, 2026