the.com/opacity
The art of letting nothing through — light, meaning, or accountability alike.
means The degree to which something blocks light or, figuratively, resists being seen through or understood.
from From Latin opacus, meaning shaded or dark, the same root that shadows over a tree-covered grove on a hot afternoon.
Design termZero opacity means fully transparent, ironically invisible.
Bureaucrat favoriteOften the goal disguised as a process.
PhysicsMeasures how much radiation a material absorbs.