Usually means: Decrease in amount or size.
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We found 51 dictionaries that define the word reduction:

General (25 matching dictionaries)
  1. reduction: Merriam-Webster.com
  2. reduction: Oxford Learner's Dictionaries
  3. reduction: American Heritage Dictionary of the English Language
  4. reduction: Collins English Dictionary
  5. reduction: Vocabulary.com
  6. Reduction, reduction: Wordnik
  7. reduction: Cambridge Advanced Learner's Dictionary
  8. reduction: Wiktionary
  9. reduction: Webster's New World College Dictionary, 4th Ed.
  10. reduction: The Wordsmyth English Dictionary-Thesaurus
  11. reduction: Infoplease Dictionary
  12. reduction: Cambridge Essential American English Dictionary
  13. Reduction (complexity), Reduction (cooking), Reduction (disambiguation), Reduction (linguistics), Reduction (mathematics), Reduction (military), Reduction (music), Reduction (orthopedic surgery), Reduction (philosophy), Reduction (recursion theory), Reduction: Wikipedia, the Free Encyclopedia
  14. Reduction: Online Plain Text English Dictionary
  15. reduction: Webster's Revised Unabridged, 1913 Edition
  16. reduction: Rhymezone
  17. reduction: AllWords.com Multi-Lingual Dictionary
  18. reduction: Webster's 1828 Dictionary
  19. reduction: Free Dictionary
  20. reduction: Mnemonic Dictionary
  21. reduction, reduction (photographic): Dictionary/thesaurus
  22. Reduction (Sweden), Reduction (chemistry): Wikipedia, the Free Encyclopedia
  23. reduction: Dictionary.com

Art (1 matching dictionary)
  1. Virginia Tech Multimedia Music Dictionary (No longer online)

Business (2 matching dictionaries)
  1. reduction: Legal dictionary
  2. BusinessDictionary.com (No longer online)

Computing (3 matching dictionaries)
  1. reduction: Free On-line Dictionary of Computing
  2. reduction: Dictionary of Algorithms and Data Structures
  3. Reduction (chemistry), reduction: Encyclopedia

Medicine (5 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. online medical dictionary (No longer online)
  3. Neurotrauma Glossary (No longer online)
  4. Reduction (chemistry), reduction: Medical dictionary
  5. Vitamin Glossary (No longer online)

Science (7 matching dictionaries)
  1. Electrochemistry Dictionary (No longer online)
  2. Archaeology Wordsmith (No longer online)
  3. Reduction: Eric Weisstein's World of Chemistry
  4. reduction: PHYSICAL ORGANIC CHEMISTRY
  5. Reduction: Material Safety Data Sheets HyperGlossary
  6. reduction, reduction, reduction: PlanetMath Encyclopedia
  7. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Sports (1 matching dictionary)
  1. 2060 Shadow-Slang (No longer online)

Tech (7 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. DOD Dictionary of Military Terms (No longer online)
  3. Reduction: A to Z of Terms related to the Thermal Spray Process and Surface Engineering
  4. Glossary of Meteorology (No longer online)
  5. PhotoNotes Dictionary of Film and Digital Photography (No longer online)
  6. Reduction: Pottery Studio
  7. REDUCTION: Power Engineering

(Note: See reductional as well.)

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

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    crimson,     burgundy,     maroon,     ruby,     scarlet, more...



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