reduction

noun

• The act, process, or result of reducing.
• The amount or rate by which something is reduced, e.g. in price.

  "A 5% reduction in robberies"

• 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.
• (computability theory) a transformation of one problem into another problem, such as mapping reduction or polynomial reduction.
• An arrangement for a far smaller number of parties, e.g. a keyboard solo based on a full opera.
• (phenomenology) 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.