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See also: réduction
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From Middle English reduccion, a Borrowing from Old French reducion, from Latin reductio, reductionem.


  • IPA(key): /ɹɪˈdʌkʃən/
  • Rhymes: -ʌkʃən
  • Hyphenation: re‧duc‧tion


reduction (countable and uncountable, plural reductions)

  1. The act, process, or result of reducing.
  2. The amount or rate by which something is reduced, e.g. in price.
    A 5% reduction in robberies
  3. (chemistry) A reaction in which electrons are gained and valence is reduced; often by the removal of oxygen or the addition of hydrogen.
  4. (cooking) The process of rapidly boiling a sauce to concentrate it.
  5. (mathematics) The rewriting of an expression into a simpler form.
  6. (computability theory) a transformation of one problem into another problem, such as mapping reduction or polynomial reduction.
  7. (music) An arrangement for a far smaller number of parties, e.g. a keyboard solo based on a full opera.
  8. (philosophy, phenomenology) A philosophical procedure intended to reveal the objects of consciousness as pure phenomena. (See phenomenological reduction.)
  9. (medicine) A medical procedure to restore a fracture or dislocation to the correct alignment.


Derived terms[edit]


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