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English definition of “volume”

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volume

noun uk   /ˈvɒl.juːm/ us    /ˈvɑːl-/

volume noun (AMOUNT)

[C or U] the amount of space that is contained within an object or solid shape: Which of these bottles do you think has the greater volume?B2 [U] the number or amount of something in general: It's the sheer volume of traffic in the city that is causing the problems.
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volume noun (SOUND LEVEL)

B1 [U] the level of sound produced by a television, radio, etc., or the switch or other device controlling this: Could you turn the volume down, please, I'm trying to sleep. I'll turn it up if you tell me which is the volume (= switch).
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volume noun (BOOK)

C2 [C] one in a set of related books: Now "Realms Of Strife", his second volume of memoirs, is available too.C2 [C] formal a book: While still an undergraduate, his first slim volume "Fighting Terms" enjoyed a considerable success.
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(Definition of volume from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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