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opacity has 1 distinct synonym spread across 2 of its 3 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its 2 recorded opposites are transparency, clarity.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the phenomenon of not permitting the passage of electromagnetic radiation
incomprehensibility resulting from obscurity of meaning
Synonyms, antonyms and the broader and narrower relations for opacity come from Princeton University’s WordNet. Full sources and licences.
the quality of being opaque to a degree; the degree to which something reduces the passage of light