1 a [noncount] : the amount of sound that is produced by a television, radio, stereo, etc.
▪ The volume is too loud. ▪ Can you turn the volume up/down? ▪ playing music at full/top/high/low volume ▪ This knob controls volume.
b [count] : a knob, lever, etc., that controls the amount of sound something makes
▪ She fiddled with the volume on the stereo. 2 : an amount of something [count] ▪ a high/low/large/small volume of sales ▪ Huge volumes of park visitors come through every weekend. [noncount] ▪ an increase in traffic volume 3 : the amount of space that is filled by something [count] ▪ The box has a volume of three cubic meters. [noncount] ▪ We measure the items by weight, not by volume. 4 [count] a : a book
▪ This thin little volume is a delightful read.
b : a book that is part of a series or set of books
▪ a long novel that was published in three volumes ▪ The first volume of the series was disappointing, but I hear the second volume is better.
c : one of the magazines, newspapers, etc., in a series
▪ The article appears in volume 19, number 4.