# reduction
## English
### Etymology

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

### Pronunciation

* IPA: /ɹɪˈdʌkʃən/
* Audio (Southern England):(file)
* (Malaysia, Singapore) IPA: /ɹiˈdɑk.ʃən/
* Hyphenation: re‧duc‧tion
* Rhymes: -ʌkʃən

### Noun

reduction (countable and uncountable, plural reductions)
* The act, process, or result of reducing.
** 1961 January, “The North-East London electrification of the Great Eastern Line”, in Trains Illustrated, page 18:With the cutting out of the previous recovery times for electrification work, curtailment of station times and acceleration, considerable reductions have been made in the overall schedules.
* The amount or rate by which something is reduced, e.g. in price.
    A 5% reduction in robberies
* (chemistry) A reaction in which electrons are gained and valence is reduced; often by the removal of oxygen or the addition of hydrogen.
* (cooking) The process of rapidly boiling a sauce to concentrate it.
* (mathematics) The rewriting of an expression into a simpler form.
* (computability theory) A transformation of one problem into another problem, such as mapping reduction or polynomial-time reduction.
* (music) An arrangement for a far smaller number of parties, e.g. a keyboard solo based on a full opera.
* (philosophy, phenomenology) A philosophical procedure intended to reveal the objects of consciousness as pure phenomena. (See phenomenological reduction.)
* (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).
    Synonym: taxis
    Coordinate terms: arthroplasty, arthrodesis
    closed reduction
    open reduction and internal fixation
* (paying) A reduced price of something by a fraction or decimal.
* (metalworking) The ratio of a material's change in thickness compared to its thickness prior to forging and/or rolling.
** 2016, Gordon L. Robertson, Food Packaging Principles and Practice, 3rd edition, page 191:The final stage of thickness reduction (typically 90% from about 2mm to <0.2mm) is carried out by cold rolling.
* (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.
    Spanish reductions in Mexico were common during the 18th century.

#### Synonyms

* (act, process, or result of reducing): decline, lessening; See also Thesaurus:diminution
* (amount by which something is reduced): extract, reduction; See also Thesaurus:decrement

#### Antonyms

* (antonym(s) of “act, process, or result of reducing”): elevation, expansion, increase, promotion; See also Thesaurus:augmentation
* (antonym(s) of “amount by which something is reduced”): addition, supplement; See also Thesaurus:adjunct
* (antonym(s) of “chemistry”): oxidation

#### Derived terms

* amnioreduction
* beta reduction
* bioreduction
* Birch reduction
* boob reduction
* breast reduction
* carboreduction
* carbothermal reduction
* Clemmensen reduction
* Cook reduction
* cytoreduction
* decimal reduction time
* deuteroreduction
* eidetic reduction
* electroreduction
* eta reduction
* harm reduction
* hazard reduction burn
* irreduction
* Karp reduction
* ketoreduction
* leukoreduction
* magnesiothermic reduction
* mapping reduction
* Meerwein-Ponndorf-Verley reduction
* monoreduction
* nitroreduction
* nonreduction
* orchestrated objective reduction
* overreduction
* oxidation-reduction
* phenomenological reduction
* photoreduction
* polynomial reduction
* polynomial-time reduction
* postreduction
* prereduction
* prolongational reduction
* pseudoreduction
* reductional
* reduction division
* reduction drive
* reduction furnace
* reduction in force
* reductionism
* reductionist
* reduction set
* reduction to the absurd
* rereduction
* semireduction
* spot reduction
* tax reduction
* time-span reduction
* Turing reduction
* vowel reduction

#### Related terms

* reducible

#### Translations

    The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.

### Anagrams

* introduce