Definitions from Wiktionary ( )

▸ noun:  The act, process, or result of reducing.
▸ noun:  The amount or rate by which something is reduced, e.g. in price.
▸ noun:  (chemistry) A reaction in which electrons are gained and valence is reduced; often by the removal of oxygen or the addition of hydrogen.
▸ noun:  (cooking) The process of rapidly boiling a sauce to concentrate it.
▸ noun:  (mathematics) The rewriting of an expression into a simpler form.
▸ noun:  (computability theory) A transformation of one problem into another problem, such as mapping reduction or polynomial-time reduction.
▸ noun:  (music) An arrangement for a far smaller number of parties, e.g. a keyboard solo based on a full opera.
▸ noun:  (philosophy, phenomenology) A philosophical procedure intended to reveal the objects of consciousness as pure phenomena. (See phenomenological reduction.)
▸ noun:  (medicine) A medical procedure to restore a fracture or dislocation to the correct alignment, usually with a closed approach but sometimes with an open approach (surgery).
▸ noun:  (paying) A reduced price of something by a fraction or decimal.
▸ noun:  (metalworking) The ratio of a material's change in thickness compared to its thickness prior to forging and/or rolling.
▸ noun:  (historical, Roman Catholicism) A religious settlement created during a mission by Spanish or Portuguese colonists with the intent of evangelizing Christianity to the local population.

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