cal·i·ber (US) or Brit cal·i·bre 
/ˈkæləbɚ/ noun
plural cal·i·bers /ˈkæləbɚ/ noun 1 [noncount] : level of excellence, skill, etc.
▪ The school will only hire teachers of the highest caliber. [=will only hire the best teachers] ▪ I was impressed by the high caliber of the team's work. ▪ It is exciting to meet a writer of his caliber. [=a writer as good/skillful as he is] ▪ The two colleges are not of the same caliber. [=one of the colleges is better than the other] 2 [count] : a measurement of the width of a bullet or a gun barrel
▪ a .22-caliber bullet [=a bullet that is 22 hundredths of an inch in diameter] ▪ a high-caliber bullet
▪ The school will only hire teachers of the highest caliber. [=will only hire the best teachers] ▪ I was impressed by the high caliber of the team's work. ▪ It is exciting to meet a writer of his caliber. [=a writer as good/skillful as he is] ▪ The two colleges are not of the same caliber. [=one of the colleges is better than the other]
▪ a .22-caliber bullet [=a bullet that is 22 hundredths of an inch in diameter] ▪ a high-caliber bullet
