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mul·ti·ply1 / ˈməltəˌplī/ • v. (-plies, -plied) [tr.] obtain from (a number) another that contains the first number a specified number of times: I asked you to multiply fourteen by nineteen | [intr.] we all know how to multiply by ten. ∎  increase or cause to increase greatly in number or quantity: [intr.] ever since I became a landlord my troubles have multiplied tenfold | [tr.] cigarette smoking combines with other factors to multiply the risks of atherosclerosis. ∎  [intr.] (of an animal or other organism) increase in number by reproducing. ∎  propagate (plants). mul·ti·ply2 / ˈməltəplē/ • adv. in several different ways or respects: multiply injured patients.

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