reduction

plural reductions

1. countableuncountableThe act, process, or result of reducing.

   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.

   1961 January, “The North-East London electrification of the Great Eastern Line”, in Trains Illustrated, page 18

   Synonyms: decline

2. countableuncountableThe amount or rate by which something is reduced, e.g. in price.

   A 5% reduction in robberies

   Synonyms: extract

3. countableuncountablechemistryA reaction in which electrons are gained and valence is reduced; often by the removal of oxygen or the addition of hydrogen.
4. countableuncountablecookingThe process of rapidly boiling a sauce to concentrate it.
5. countableuncountablemathematicsThe rewriting of an expression into a simpler form.
6. countableuncountablecomputerA transformation of one problem into another problem, such as mapping reduction or polynomial-time reduction.
7. countableuncountableentertainmentAn arrangement for a far smaller number of parties, e.g. a keyboard solo based on a full opera.
8. countableuncountablehuman sciencesA philosophical procedure intended to reveal the objects of consciousness as pure phenomena. (See phenomenological reduction.)
9. countableuncountablemedicineA medical procedure to restore a fracture or dislocation to the correct alignment, usually with a closed approach but sometimes with an open approach (surgery).

   closed reduction

   1 more example

   open reduction and internal fixation

   Synonyms: taxis

10. countableuncountablepayingA reduced price of something by a fraction or decimal.
11. countableuncountableartsThe ratio of a material's change in thickness compared to its thickness prior to forging and/or rolling.

    The final stage of thickness reduction (typically 90% from about 2mm to <0.2mm) is carried out by cold rolling.

    2016, Gordon L. Robertson, Food Packaging Principles and Practice, 3rd edition, page 191

12. countablehistoricaluncountableCatholicismA 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.