Definition of reduce verb from the Oxford Advanced American Dictionary

      

    reduce

     verb
    verb
    NAmE//rɪˈdus//
     
    Verb Forms present simple I / you / we / they reduce
     
    he / she / it reduces
     
    past simple reduced
     
    -ing form reducing
     
     
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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 $30 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] (informal) to lose weight by limiting the amount and type of food that you eat a reducing plan
  4. 4 [transitive] reduce something (to something) to change a fraction to the form with the lowest numbers The fraction 2/10 can be reduced to 1/5.
  5. 5 [transitive] reduce something (chemistry) to add one or more electrons to a substance, or to remove oxygen from a substance compare oxidize
  6. Idioms
    reduced circumstances
     
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    the state of being poorer than you were before. People sayliving in reduced circumstancesto avoid sayingpoor.
    Phrasal Verbsreduce something to somethingreduce somebody/something (from something) to something/to doing something
See the Oxford Advanced Learner's Dictionary entry: reduce