1
: the quality of a material that does not allow light to pass through it : the quality of being opaque
the opacity of the glass
2
formal
: the quality of being difficult to understand or explain
Critics have noted the opacity of her writing style.
Cite this Entry
“Opacity.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/opacity. Accessed 23 Jun. 2026.
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