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'Reduction' is the process of lowering, degrading, or diminishing.
'Reduction' or 'reducing' may also refer to:

★ Reduction (chemistry), a process of lowering the positive valence state of an element (e.g., reducing an ore to metal); the reverse of oxidation, half of a redox reaction.

★ Reduction (cooking), the process of thickening a liquid mixture such as a sauce by evaporation

★ Reduction (philosophy), in philosophy, the process of explaining a particular concept or phenomenon in terms of more fundamental concepts or phenomena

★ Reduction (linguistics), in linguistics, the shortening of the pronunciation of a word. e.g. wanna, lemme, gimme.

★ Reduction, in physiology, another name for weight loss or dieting

★ Reduction (orthopedic surgery), in orthopedic surgery, a medical procedure to restore a fracture to a correct alignment

★ Reduction (town), a form of Catholic mission in South America in the 17th and 18th centuries

★ Purchasing reduction, in economics and in waste management, is the process of decreasing the purchase of consumer goods

★ Reduction (Sweden), in 1680 a return of lands to the Crown earlier granted to the nobility.

★ Waste reduction is the first and most desirable component of the waste hierarchy (reduce, reuse, recycle)
In 'mathematics' and 'computer science':

★ Reduction (mathematics), the process of manipulating a series of equations or matrices into a desired 'simpler' format

★ Reducible representation in representation theory, a representation with nontrivial subrepresentations.

★ Reduction property, in descriptive set theory, a pointclass allows partitioning the union of two sets in the pointclass into two disjoint sets in the same pointclass

★ Reduction (complexity), in computational complexity theory, the transformation of an instance of one problem into an instance of another

★ Reduce computer algebra system, a general-purpose computer algebra system geared towards applications in physics.

★ Reduce (higher-order function), a family of higher-order functions that process a data structure in some order and build up a return value.