Caliber Definition
 kălə-bər 
    noun
  
 The size of a bullet or shell as measured by its diameter.
 Webster's New World 
The diameter of the bore of a firearm, usually shown in hundredths or thousandths of an inch and expressed in writing or print in terms of a decimal fraction.
 .45 caliber.
 American Heritage 
The diameter of a cylindrical body or of its hollowed interior.
 Webster's New World 
The diameter of the bore of a gun, usually measured in hundredths of inches or in millimeters.
 Webster's New World 
Degree of worth or value of a person or thing; quality or ability.
 Webster's New World 
Other Word Forms of Caliber
Noun
Singular:
 caliberPlural:
 calibersOrigin of Caliber
-  French calibre from Italian calibro from Arabic qālib, qālab mold, shoe tree from Greek kālapous shoemaker's last kālon wood pous foot ped- in Indo-European roots From American Heritage Dictionary of the English Language, 5th Edition 
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