the quality of someone or something, especially someone's ability

If teaching paid more it might attract people of (a) higher calibre. 如果提高教师的工资，也许会吸引更高水平的人才。

The competition entries were of such (a) high calibre that judging them was very difficult. 参赛作品水平都很高，很难对它们作出评判。

the width of the inside of a pipe, especially of the long cylinder-shaped part of a gun, or the width of a bullet