Definitions

1. noun

The state or quality of not being transparent or translucent; the measure of the amount of light that is blocked or absorbed by a substance or object, expressed as a decimal value between 0 and 1.

“The artist experimented with different levels of opacity to achieve the desired effect in her painting.”

2. noun

Lack of clarity or transparency in thought, expression, or action; obscurity.

“The politician’s opacity on the issue made it difficult for voters to make an informed decision.”

3. noun

A measure of the amount of matter or energy in a given region of space, used in astronomy to describe the amount of light blocked by a star or other celestial object.

“The astronomer used the opacity of the interstellar medium to estimate the distance to a distant star.”