volume

volume /ˈvɑːlˌjuːm/ noun
plural volumes
volume
/ˈvɑːlˌjuːm/
noun
plural volumes
Britannica Dictionary 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
2 
: an amount of something
[count]
[noncount]
3 
: the amount of space that is filled by something
[count]
[noncount]
4 
[count]
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

speak volumes

: to provide a lot of information about something : to show something very clearly