reduction

noun12

1. •
   The 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
2. •
   The process of rapidly boiling a sauce to concentrate it.
3. •
   The rewriting of an expression into a simpler form.
4. •
   An arrangement for a far smaller number of parties, e.g. a keyboard solo based on a full opera.
5. •
   The amount or rate by which something is reduced, e.g. in price.
6. •
   A reduced price of something by a fraction or decimal.
7. •
   The 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
8. •
   A reaction in which electrons are gained and valence is reduced; often by the removal of oxygen or the addition of hydrogen.
9. •
   A transformation of one problem into another problem, such as mapping reduction or polynomial-time reduction.
10. •
    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).
11. •
    (historical) 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.
12. •
    A philosophical procedure intended to reveal the objects of consciousness as pure phenomena. (See phenomenological reduction.)