/
ˈkalɪbə/
n.
  - quality of character or level of ability. 
▸the standard reached by something.
 - the internal diameter of a gun barrel. 
▸the diameter of a bullet, shell, or rocket.
 
Derivative
Etymology
C16 (in the sense ‘social standing’): from Fr., from Ital. calibro, perh. from Arab. ḳālib ‘mould’.