Meaning of “multiply” in the English Dictionary

"multiply" in British English

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multiplyverb [ I or T ]

uk /ˈmʌl.tɪ.plaɪ/ us /ˈmʌl.tə.plaɪ/
multiplication
noun [ U ] uk /ˌmʌl.tɪ.plɪˈkeɪ.ʃən/ us /ˌmʌl.tə.pləˈkeɪ.ʃən/

(Definition of “multiply” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"multiply" in American English

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multiplyverb [ I/T ]

us /ˈmʌl·təˌplɑɪ/

multiply verb [ I/T ] (calculate)

mathematics to add a number to itself a particular number of times:

[ T ] If you multiply 7 by 15 you get 105.

multiply verb [ I/T ] (INCREASE)

to increase greatly in number:

[ I ] The viruses multiply within the body.

(Definition of “multiply” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"multiply" in Business English

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multiplyverb [ I or T ]

uk /ˈmʌltɪplaɪ/ us

to increase a lot in number or to make something do this:

Lawsuits against big drugs companies have multiplied in recent years.
According to Peruvian authorities, chemical fertilizers are multiplying coca leaf production by up to 1,000% per hectare.

if you multiply a number, you add another number to it a particular number of times:

multiply sth by 6/50/120, etc. Multiply your income by 3 to get a rough idea of what size of mortgage you can apply for.
be multiplied by 6/50/120, etc. The total figure must be multiplied by 75% to produce the amount paid out to investors.
They learn how to add, subtract, divide, and multiply.

(Definition of “multiply” from the Cambridge Business English Dictionary © Cambridge University Press)