What is reduction ratio measured in. Learn more. [countable, uncountable] an act of making something less or smaller; the state of being made less or smaller. The reverse of oxidation. The meaning of REDUCTION is the act or process of reducing : the state of being reduced. the act of reducing something; 2 : an amount by which something is reduced Reduction is the act of making something smaller in size or amount, or less in degree. reduction 1. Some staff received wage rises, while others experienced a reduction. a new strategic arms reduction agreement. A surgical method of restoring an original relationship, for example by manipulating bones or hernias back into the original position. REDUCTION meaning: 1 : the act of making something smaller in size, amount, number, etc. Reduction is a process or reaction in which a substance gains electrons, or the oxidation state of an element in it decreases. See ‘Meaning & use’ for definitions, usage, and quotation evidence. . There are 35 meanings listed in OED's entry for the noun reduction, three of which are labelled obsolete. Reduction definition: The result of reducing. REDUCTION definition: 1. Definition of reduction noun from the Oxford Advanced Learner's Dictionary. How to use reduction in a sentence. Reduction operator, a type of operator that is commonly used in parallel programming to reduce the elements of an array into a single result. the act of making something, or of something becoming, smaller in size, amount, degree…. 2. geezofmn ssnvvr afc nuunraj katgls tgxdzdx tzpm mntn jltd gyabphvns