Learner's definition of VOLUME
1 a [noncount] : the amount of sound that is produced by a television, radio, stereo, etc.
b [count] : a knob, lever, etc., that controls the amount of sound something makes
The volume is too loud.
Can you turn the volume up/down?
playing music at full/top/high/low volume
This knob controls volume.
2 : an amount of something
3 : the amount of space that is filled by something
4 a : a book b : a book that is part of a series or set of books
c : one of the magazines, newspapers, etc., in a series
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.
: to provide a lot of information about something: to show something very clearly