Definition of reduce verb from the Oxford Advanced Learner's Dictionary

      

    reduce

     verb
    verb
    BrE BrE//ˈdjuːs//
     
    ; NAmE NAmE//ˈduːs//
     
    Verb Forms present simple I / you / we / they reduce
    BrE BrE//ˈdjuːs//
     
    ; NAmE NAmE//ˈduːs//
     
    he / she / it reduces
    BrE BrE//rɪˈdjuːsɪz//
     
    ; NAmE NAmE//rɪˈduːsɪz//
     
    past simple reduced
    BrE BrE//rɪˈdjuːst//
     
    ; NAmE NAmE//rɪˈduːst//
     
    past participle reduced
    BrE BrE//rɪˈdjuːst//
     
    ; NAmE NAmE//rɪˈduːst//
     
    -ing form reducing
    BrE BrE//rɪˈdjuːsɪŋ//
     
    ; NAmE NAmE//rɪˈduːsɪŋ//
     
     
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  1. 1  [transitive] to make something less or smaller in size, quantity, price, etc. reduce something Reduce speed now (= on a sign). Giving up smoking reduces the risk of heart disease. reduce something by something Costs have been reduced by 20% over the past year. reduce something (from something) (to something) The number of employees was reduced from 40 to 25. The skirt was reduced to £10 in the sale.
  2. 2[transitive, intransitive] reduce (something) if you reduce a liquid or a liquid reduces, you boil it so that it becomes less in quantity
  3. 3[intransitive] (North American English, informal) to lose weight by limiting the amount and type of food that you eat a reducing plan
  4. 4 [transitive] reduce something (chemistry) to add one or more electrons to a substance or to remove oxygen from a substance compare oxidize
  5. Word Origin late Middle English: from Latin reducere, from re- ‘back, again’ + ducere ‘bring, lead’. The original sense was ‘bring back’ ; this led to ‘bring to a different state’, then ‘bring to a simpler or lower state’ (hence sense (2)); and finally ‘diminish in size or amount’ (sense (1), dating from the late 18th cent.).Extra examples I noticed that my belly had drastically reduced in size. Legislation progressively reduced the number of situations in which industrial action could be taken. Pollution from the works has been reduced by 70 per cent. The price is reduced from 99 cents to 85 cents. The risks must be reduced to the absolute minimum. We need to reduce the speed slightly. Costs have been reduced by 20% over the past year. Reduce speed now.Idioms the state of being poorer than you were before. People say living in reduced circumstances to avoid saying poor. Phrasal Verbsreduce somebody from something to doing somethingreduce something to something
See the Oxford Advanced American Dictionary entry: reduce