caliber
noun
cal·i·ber
ˈka-lə-bər
British also kə-ˈlē-
variants
or calibre
1
a
: degree of mental capacity or moral quality
teachers of high caliber
b
: degree of excellence or importance
the caliber of instruction
2
a
: the diameter of a bullet or other projectile
b
: the diameter of a bore of a gun usually expressed in hundredths or thousandths of an inch and typically written as a decimal fraction
.32 caliber
3
: the diameter of a round or cylindrical body
especially
: the internal diameter of a hollow cylinder
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Merriam-Webster unabridged
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