Definitions from Wiktionary (opacity)

▸ noun:  (uncountable) The state or quality of being opaque, not allowing light to pass through
▸ noun:  (uncountable) The state or quality of being inaccessible to understanding.
▸ noun:  (optics, countable) A measure of relative impenetrability to electromagnetic radiation such as light.
▸ Also see opacity




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