What is the definition of volume?

Physics

Volume is the space occupied by a material or object.

Volume is measured in units that reflect a three-dimensional form, e.g. cubic meters, cubic feet, cubic miles. Volume can be determined by direct measurement or by displacement (as in a liquid). The volume of a gas will vary by its pressure, and liquid and solid volumes normally increase (somewhat) with increased temperature, reflecting a decreased density.

Publications

A volume is one book within a set or group of books, or a book of bound sheets. It is also used to represent a period of publication, usually one year.

Sound

Volume is the loudness of a sound, as expressed by its amplitude, and related to its intensity and power.