reduction

The act, process, or result of reducing.
The amount or rate by which something is reduced, e.g. in price.
A reaction in which electrons are gained and valence is reduced; often by the removal of oxygen or the addition of hydrogen.
The process of rapidly boiling a sauce to concentrate it.
The rewriting of an expression into a simpler form.
A transformation of one problem into another problem, such as mapping reduction or polynomial-time reduction.
An arrangement for a far smaller number of parties, e.g. a keyboard solo based on a full opera.
A philosophical procedure intended to reveal the objects of consciousness as pure phenomena. (See phenomenological reduction.)
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).
A reduced price of something by a fraction or decimal.
The ratio of a material's change in thickness compared to its thickness prior to forging and/or rolling.