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The following statistics are based on the British National Corpus, so they are representative for the British English.

Distribution of usage frequency for the most common synonyms of the noun reduction:

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Definition of the noun reduction

What does reduction mean as a name of something?

Reduction is one of the top 1000 most common nouns in the English language.

noun - plural: reductions

  1. the act of decreasing or reducing something
  2. any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent
  3. the act of reducing complexity

Alternative definition of the noun reduction


  1. The act, process, or result of reducing.
  2. The amount or rate by which something is reduced, e.g. in price.
  3. [chemistry] A reaction in which electrons are gained and valence is reduced; often by the removal of oxygen or the addition of hydrogen.
  4. [cooking] The process of rapidly boiling a sauce to concentrate it.
  5. [mathematics] The rewriting of an expression into a simpler form.
    • [context: computability theory] a transformation of one problem into another problem, such as mapping reduction or polynomial reduction.
    • [music] An arrangement for a far smaller number of parties, e.g. a keyboard solo based on a full opera.
    • [philosophy, phenomenology] A philosophical procedure intended to reveal the objects of consciousness as pure phenomena. (See phenomenological reduction.)


    1. "Reduction" is a musical album of Art of Noise.
      • released in (15 years ago)
    2. "Reduction" is a musical EP of Elting Lieb.
      • released in (15 years ago)
    3. "Reduction" is a 2006 single album by deadmau5.
      • released on (8 years ago)
    4. "Reduction" is a musical album of Peter Banks.
      • released on (15 years ago)
    5. "Reduction" is a composition.


    1. Reduction: In computability theory and computational complexity theory, a reduction is an algorithm for transforming one problem into another problem. A reduction from one problem to another may be used to show that the second problem is at least as difficult as the first. The mathematical structure generated on a set of problems by the reductions of a particular type generally forms a preorder, whose equivalence classes may be used to define degrees of unsolvability and complexity classes.
      • also known as การลดรูป (ความซับซ้อน), 歸約
    2. Reduction: In cooking, reduction is the process of thickening and intensifying the flavor of a liquid mixture such as a soup, sauce, wine, or juice by simmering or boiling. Reduction is performed by simmering or boiling a liquid such as stock, fruit or vegetable juices, wine, vinegar, or a sauce until the desired volume is reached by evaporation. This is done without a lid, thus enabling the vapor to escape from the mixture. Different components of the liquid will evaporate at slightly different temperatures, and the goal of reduction is to drive away those with lowest points of evaporation. It thus can be seen as a form of distillation, capturing those components that have the highest boiling point.
    3. Reduction a.k.a. Piano reduction: A piano reduction is sheet music for the piano that was once music for other instruments that was reduced as kind of projection to its most basic components within a two line staff for piano. It is also considered a style of orchestration or music arrangement less well known as contraction scoring, a subset of elastic scoring.
    4. Reduction is a surgical procedure to restore a fracture or dislocation to the correct alignment. This sense of the term "reduction" does not imply any sort of removal or quantitative decrease but rather implies a restoration: re + ducere, i.e., "bringing back to normal." When a bone fractures, the fragments lose their alignment in the form of displacement or angulation. For the fractured bone to heal without any deformity the bony fragments must be re-aligned to their normal anatomical position. Orthopedic surgery attempts to recreate the normal anatomy of the fractured bone by reduction of the displacement.
    5. Reduction: The reductions in Sweden were the return to the Crown of the fiefs that had been granted to the Swedish nobility.
    6. Reduction: In mathematics, reduction refers to the rewriting of an expression into a simpler form. For example, the process of rewriting a fraction into one with the smallest whole-number denominator possible is called "reducing a fraction". Rewriting a radical expression with the smallest possible whole number under the radical symbol is called "reducing a radical".
    7. Reduction: En filosofía de la ciencia, la reducción es una operación epistémica por la cual se identifican dos objetos reales o dos objetos conceptuales o bien un objeto se incluye en otro o se explica por otro.
    8. Reduction: In computability theory, many reducibility relations are studied. They are motivated by the question: given sets A and B of natural numbers, is it possible to effectively convert a method for deciding membership in B into a method for deciding membership in A? If the answer to this question is affirmative then A is said to be reducible to B.

    Phrases with Reduction

    Phrases starting with the word Reduction:

    1. reduction gear
    2. reduction division
    3. Reduction in force

    Phrases ending with the word Reduction:

    1. Tax Reduction
    2. Beta Reduction
    3. price reduction
    4. Breast reduction
    5. oxidation-reduction
    6. temperature reduction
    7. Carbothermal Reduction
    8. Prolongational Reduction
    9. Magnesiothermic Reduction
    10. Phenomenological Reduction

    Other phrase containing the word Reduction:

    1. oxidation-reduction indicator

    Printed dictionaries and other books with definitions for Reduction

    Click on a title to look inside that book (if available):

    Google previewOver the Influence (2003)

    The Harm Reduction Guide for Managing Drugs and Alcohol by Patt Denning, Jeannie Little, Adina Glickman

    Harm reduction says Just Say Know (know what and how much you are using). • Harm reduction means taking care of yourself, regardless of the status of your drug use. • Harm reduction means getting nondiscriminatory care from others, ...

    Google previewNature, Human Nature, and God

    by Ian G. Barbour

    Methodological reduction is a research strategy: the study of lower levels in order to better understand relationships at higher levels. Analysis of molecular interactions has been a spectacularly successful strategy in biology, but it is not ...

    Google previewOperator Algebras and Their Applications (2016)

    by Robert S. Doran, Efton Park

    The first reduction is that by passing to the bidual we may assume that the algebra A is unital. The second reduction is that by cutting down to qAq, where q = P(1) (which one can show is a projection), we may further assume that P(1) = 1 (one ...

    Google previewMachine Learning and Knowledge Discovery in Databases (2008)

    European Conference, Antwerp, Belgium, September 15-19, 2008, Proceedings by Walter Daelemans

    Nonlinear Dimensionality Reduction is an important issue in many machine learning areas where essentially low-dimensional data is nonlinearly embedded in some high-dimensional space. In this paper, we show that the existing Laplacian ...

    Google previewTransactions on Large-Scale Data- and Knowledge-Centered Systems XVII (2015)

    Selected Papers from DaWaK 2013 by Abdelkader Hameurlain, Josef Küng, Roland Wagner, Ladjel Bellatreche, Mukesh Mohania

    Dimensionality reduction is a crucial ingredient of machine learning and data mining, boosting classification accuracy...

    factorization · Supervised dimensionality reduction 1 Introduction Dimensionality reduction is an important ingredient of ...

    Google previewKnowledge-based Intelligent Information Engineering Systems & Allied Technologies (2001)

    KES'2001 by Norio Baba, L. C. Jain, Robert J. Howlett

    Dimensionality reduction is a way to overcome these problems. Principal Component Analysis (PCA) and Singular Value Decomposition (SVD) are popular techniques for dimensionality reduction based on matrix decomposition, however they ...

    Google previewEncyclopedia of Social Problems (2008)

    by Vincent N. Parrillo

    Harm reduction is a broad term applied to a variety of programs and policies, so there is no clear consensus on its meaning, although its aim is to reduce the adverse consequences of drug use and even of drug control policies. The term ...

    Google previewComputer Aided Verification (2002)

    14th International Conference, CAV 2002 Copenhagen, Denmark, July 27-31, 2002 Proceedings by Ed Brinksma, Kim G. Larsen

    Symbolic Localization Reduction with Reconstruction Layering and Backtracking Sharon Barner, Daniel Geist and Anna Gringauze IBM Haifa Research Lab, Haifa Israel Abstract. Localization reduction is an abstraction-refinement scheme for ...

    Google previewEmerging Technologies for Information Systems, Computing, and Management (2013)

    by W. Eric Wong, Tinghuai Ma

    Bo Yang, Ming Xiang and Liuwu Shi Abstract Feature reduction is an important issue in pattern recognition.

    Google previewObjective Pre Engineering Chemistry

    Reduction is a reaction in which the negative valency of species is increased or the positive valency is decreased.

    which results in the gain of one or more electrons by atoms or ions is called reduction or electronation (gain of electrons).

    Google previewEncyclopedia of Public Relations (2013)

    by Robert L. Heath

    uncertainty reduction theory assumes people seek to reduce uncertainty about themselves and others in initial encounters. The extent of that drive is affected by how positive, negative, ...

    Google previewEncyclopedia of Chemical Processing and Design (1991)

    Volume 37 - Pipeline Flow: Basics to Piping Design by John J. McKetta Jr

    (see also Pipeline Design, Slurry Systems, Energy Reduction) Part A: The Basics ot Drag Reduction Drag reducing agents (DRA's) can substantially reduce friction loss in most pipelines when flowing most hydrocarbon liquids. This article is in ...

    Google previewSmart Grid Dictionary Plus (2011)

    by Christine Hertzog

    Potential peak reduction The DR (Demand Reduction) that is possible during events that trigger requests to curtail load. It is not the actual peak reduction. For utilities, the calculation is the potential sum of the DR capability ...

    Google previewThe Encyclopedia of Psychological Trauma (2008)

    by Gilbert Reyes, Jon D. Elhai, Julian D. Ford

    Habituation involves a reduction in an unconditioned response (UCR) upon repeated presentation of an unconditioned stimulus (UCS). For example, habituation might involve a decrease in the startle response (UCR) when a loud noise ...

    Google previewThe British encyclopedia, or, Dictionary of arts and sciences (1809)

    by William Nicholson

    REDUCTION of metals, in chemistry. All metals, even the few that resist the action of heat and air, undergo a similar change when exposed to acids, especially the sulphuric, the nitric, and the muriatic, or a mixture of the two last. All metals, by ...

    Google previewDictionary of Military Terms (2009)

    by U.S. Department of Defense

    The reduction in brightness of ground vehicle lights by either reducing power or by screening in such a way that any visible light is limited in output. See also normal lighting. reduced operating ...

    Google previewEncyclopedia of Crisis Management (2013)

    by K. Bradley Penuel, Matt Statler, Ryan Hagen

    Together with other legislative and institutional developments, this ensures that disaster risk reduction is addressed comprehensively as a key development issue and not as a standalone emergency management eort. In the past four years ...

    Google previewEncyclopedia of Chemical Processing and Design, Volume 69 (Supplement 1) (2001)

    by Rayford Anthony

    KLET2 Introduction to the Selective Catalytic Reduction Technology Introduction Overview The selective catalytic reduction tSCR) process has been originally developed for reducing ...

    Google previewA Dictionary of Varieties of English (2013)

    by Raymond Hickey

    'Diphthong flattening'or'glide reduction' are terms used to refer to the lack of an upward glide withthe/ai/ diphthong (and in some few varieties with/au/ aswell), thatisfive /faiv/,hide /haid/ tendtoberealized as[faːv] and [ha:d] respectively in ...

    Google previewEncyclopedia of Lifestyle Medicine and Health (2011)

    by James M. Rippe, MD

    The average reported acute postexercise reduction of blood pressure is 15/4 mm Hg in controlled settings and ~5/4 mm Hg in an ambulatory uncontrolled setting in hypertensive participants. The mechanisms contributing to this phenomenon ...

    Online dictionaries and encyclopedias with entries for Reduction

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    Small photo of Short Grass Prairie and Old Growth Trees following Fuel Reduction Control Burn near Canyon, TexasSmall photo of Short Grass Prairie and Old Growth Trees following Fuel Reduction Control Burn near Canyon, TexasSmall photo of Short Grass Prairie and Old Growth Trees following Fuel Reduction Control Burn near Canyon, TexasSmall photo of Short Grass Prairie and Old Growth Trees following Fuel Reduction Control Burn near Canyon, TexasSmall photo of Polar regions of Earth. Icebergs of various forms and sizes. Climatic changes and growth of average annual temperature on the planet. Reduction of the area of polar ices and catastrophic thawing.Small photo of dotted female body for operation of fat reductionSmall photo of Head massage for relaxation, stress reduction, health care. More...

    Video language resources about Reduction

    Click on an item to play that video:

    View more videos about Tax Reduction, Beta Reduction, Price Reduction, Breast reduction, Reduction Division, Reduction in force, Carbothermal Reduction, Prolongational Reduction, Magnesiothermic Reduction, and Phenomenological Reduction.

    See also the pronunciation examples of Reduction!

    Quotes about Reduction

    Perhaps the most important thing we can undertake toward the reduction of fear is to make it easier for people to accept themselves to like themselves. (Bonaro Overstreet)
    more quotes about reduction...

    Scrabble value of R1E1D2U1C3T1I1O1N1

    The value of this 9-letter word is 12 points. It is included in the first and second editions of the Official Scrabble Players Dictionary.

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