What does the word caliber mean?

Usage examples for caliber

  1. Then seeing a look of disappointment in both faces he hastened to say that the closed season was now on for all game excepting rabbits and hares, and if they wanted to hunt these they might take their 22 caliber rifles. – The Boy Scouts in A Trapper's Camp by Thornton W. Burgess
  2. We kids had guns but they were small 22 caliber. – The-Life-of-Me-an-autobiography by Johnson, Clarence Edgar
  3. As Bud Lee, riding hard but never without thought for the horse which carried him, began the return trip, he drew the heavy caliber revolver from his shirt and thrust it into his belt. – Judith of Blue Lake Ranch by Jackson Gregory