English
reduction
Etymology

From Middle English reduccion, a borrowing from Old French reducion, from Latin reductio.

Pronunciation
  • IPA: /ɹɪˈdʌkʃən/
  • (Malaysia, Singapore) IPA: /ɹiˈdɑk.ʃən/
Noun

reduction

  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-time 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, usually with a closed approach but sometimes with an open approach (surgery).
    Synonyms: taxis
    Coordinate terms: arthroplasty, arthrodesis
    closed reduction
    open reduction and internal fixation
  10. (paying) A reduced price of something by a fraction or decimal.
  11. (metalworking) The ratio of a material's change in thickness compared to its thickness prior to forging and/or rolling.
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