WordReference Random House Learner's Dictionary of American English © 2017
re•duc•tion /rɪˈdʌkʃən/USA pronunciation   n. 
  1. [uncountable] the act or process of reducing, or the state of being reduced.
  2. the amount by which something is reduced:[countable]a pay reduction of fifty percent.
See -duc-.
WordReference Random House Unabridged Dictionary of American English © 2017
re•duc•tion  (ri dukshən),USA pronunciation n. 
  1. the act of reducing or the state of being reduced.
  2. the amount by which something is reduced or diminished.
  3. a form produced by reducing;
    a copy on a smaller scale.
  4. Cell Biologymeiosis, esp. the first meiotic cell division in which the chromosome number is reduced by half.
  5. Chemistrythe process or result of reducing.
  6. Cinema, Show Business[Motion Pictures.]the process of making a print of a narrower gauge from a print of a wider gauge:the reduction of 35-mm films to 16-mm for the school market.
  7. a village or settlement of Indians in South America established and governed by Spanish Jesuit missionaries.
re•duction•al, adj. 
  • Latin reductiōn- (stem of reductiō) a bringing back, equivalent. to reduct(us) (past participle of redūcere; see reduce) + -iōn- -ion
  • Middle French reduction
  • earlier reduccion 1475–85

Collins Concise English Dictionary © HarperCollins Publishers::

reduction /rɪˈdʌkʃən/ n
  1. the act or process or an instance of reducing
  2. the state or condition of being reduced
  3. the amount by which something is reduced
  4. a form of an original resulting from a reducing process, such as a copy on a smaller scale
  5. a simplified form, such as an orchestral score arranged for piano
  6. the process of converting a fraction into its decimal form
  7. the process of dividing out the common factors in the numerator and denominator of a fraction; cancellation

reˈductive adj

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