calibernoun
us/ˈkæl·ə·bər/caliber noun (QUALITY)
[ U ] the degree of quality or excellence of something or someone:
It’s not easy to recruit high caliber personnel.
caliber noun (MEASUREMENT)
[ C ] the width of the inside of a pipe, esp. of the long, cylindrical part of a gun, or the width of a bullet:
a .22-caliber rifle