Noun caliber has 2 senses
  1. quality, caliber, calibre - a degree or grade of excellence or worth; "the quality of students has risen"; "an executive of low caliber"
    --1 is a kind of degree, grade, level
    --1 has particulars: superiority, high quality; inferiority, low quality
  2. bore, gauge, caliber, calibre - diameter of a tube or gun barrel
    --2 is a kind of diameter, diam
    Derived form: verb calibrate3