Which of the following is a primary meaning of volume?

• A. The amount of space taken up by something
• B. The sound level
• C. An amount of something
• D. The meaning of the word volume

Answer: (A)

Volume primarily means the amount of space that a substance or object occupies. This is a concrete, foundational idea that fits everyday and scientific use alike, because it describes how much three‑dimensional space something takes up, like the capacity of a container or the size of a room.

Other senses exist, such as volume referring to how loud a sound is—this uses the same word but a different idea, focusing on intensity rather than physical space. There’s also the sense of volume meaning an amount or quantity of something, as in a large volume of data or books; that’s a related but more abstract usage. The option about “the meaning of the word volume” isn’t itself a distinct sense, so it doesn’t fit.

So the most direct, widely applicable sense is the amount of space something occupies.