reduction

1. (chemistry) A reaction in which electrons are gained and valence is reduced; often by the removal of oxygen or the addition of hydrogen.countableuncountable

2. (cooking) The process of rapidly boiling a sauce to concentrate it.countableuncountable

3. (mathematics) The rewriting of an expression into a simpler form.countableuncountable

4. (computing theory) A transformation of one problem into another problem, such as mapping reduction or polynomial-time reduction.countableuncountable

5. (music) An arrangement for a far smaller number of parties, e.g. a keyboard solo based on a full opera.countableuncountable

6. (philosophy, phenomenology) A philosophical procedure intended to reveal the objects of consciousness as pure phenomena. (See phenomenological reduction.)countableuncountable