o ‧ pac ‧ i ‧ ty /əʊˈpæsəti, əʊˈpæsɪti $ oʊ-/ BrE AmE noun [uncountable]
[ Date: 1500-1600 ; Language: French ; Origin: opacité , from Latin opacitas , from opacus ; ⇨ ↑ opaque ]
1 . the quality that something has when it is difficult to see through ⇨ opaque
2 . the quality that something has when it is difficult to understand SYN obscurity