Other
- Ego reduction, predicated on the use of Sigmund Freud's concept of the ego
- Piano reduction, sheet music for the piano that was once music for other instruments that was reduced to its most basic components within a two line staff for piano
- Reduction (cooking), the process of thickening or intensifying the flavor of a liquid mixture such as a soup, sauce, wine, or juice by evaporation
- Reductio ad absurdum, a form of argument in which a proposition is disproven by following its implications to an absurd consequence
- Reduction in rank, military law
- Reduction to practice, in United States patent law, the embodiment of the concept of an invention
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