Definition of multiply verb from the Oxford Advanced American Dictionary

      

    multiply

     verb
    verb
    NAmE//ˈmʌltəˌplaɪ//
     
    Verb Forms present simple I / you / we / they multiply
     
    he / she / it multiplies
     
    past simple multiplied
     
    -ing form multiplying
     
     
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  1. 1[intransitive, transitive] to add a number to itself a particular number of times The children are already learning to multiply and divide. multiply A by B 2 multiplied by 4 is/equals/makes 8 (2×4 = 8) multiply A and B (together) Multiply 2 and 6 together and you get 12.
  2. 2[intransitive, transitive] to increase or make something increase very much in number or amount Our problems have multiplied since last year. multiply something Cigarette smoking multiplies the risk of cancer.
  3. 3[intransitive, transitive] (biology) to reproduce in large numbers; to make something do this Rabbits multiply rapidly. multiply something It is possible to multiply these bacteria in the laboratory.
See the Oxford Advanced Learner's Dictionary entry: multiply