Definition of volume:
the amount of 3-dimensional space occupied by an object; "the gas expanded to twice its original volume"
the property of something that is great in magnitude; "it is cheaper to buy it in bulk"; "he received a mass of correspondence"; "the volume of exports"
physical objects consisting of a number of pages bound together; "he used a large book as a doorstop"
a publication that is one of a set of several similar publications; "the third volume was missing"; "he asked for the 1989 volume of the Annual Review"
a relative amount; "mix one volume of the solution with ten volumes of water"
the magnitude of sound (usually in a specified direction); "the kids played their music at full volume"