reduction

noun

1. The act, process, or result of reducing.
2. The amount or rate by which something is reduced, e.g. in price.
3. A reaction in which electrons are gained and valence is reduced; often by the removal of oxygen or the addition of hydrogen.
4. The process of rapidly boiling a sauce to concentrate it.
5. The rewriting of an expression into a simpler form.
6. A transformation of one problem into another problem, such as mapping reduction or polynomial-time reduction.
7. An arrangement for a far smaller number of parties, e.g. a keyboard solo based on a full opera.
8. A philosophical procedure intended to reveal the objects of consciousness as pure phenomena. (See phenomenological reduction.)
9. 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).
10. A reduced price of something by a fraction or decimal.
11. The ratio of a material's change in thickness compared to its thickness prior to forging and/or rolling.
12. A religious settlement created during a mission by Spanish or Portuguese colonists with the intent of evangelizing Christianity to the local population.