Longman Dictionary of Contemporary English - volume

~ n 1 »SPACE FILLED« the amount of space that a substance or object contains or fills  (The volume of the container measures 10,000 cubic metres. | an instrument for measuring the volume of a gas) 2 »AMOUNT« the total amount of something, especially when it is large or increasing  (The volume of traffic on the roads has increased dramatically in recent years. | the volume of trade) 3 »SOUND« the amount of sound produced by a television, radio etc  (Can you turn the volume down on the stereo.) 4 »BOOK« a) one of the books into which a very long book is divided b) formal a book  (the M - Mon volume of the encyclopedia | a volume of poetry)  (- see also speak volumes speak (11))