[{"Bold_text": "noun", "List Items": ["the diameter of something of circular section, especially that of the inside of a tube:a pipe of three-inch caliber.", "Ordnance.the diameter of the bore of a gun taken as a unit of measurement.", "degree of capacity or competence; ability:a mathematician of high caliber.", "degree of merit or excellence; quality:the high moral caliber of the era.Synonyms: distinction , worth"]}]