Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: French
Origin: opacité, from Latin opacitas, from opacus; OPAQUE

opacity

 noun
     
o‧pac‧i‧ty [uncountable]
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
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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