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say it: oh-PAS-uh-tee
opacity is a noun meaning "the phenomenon of not permitting the passage of electromagnetic radiation". It carries 3 recorded senses.
the phenomenon of not permitting the passage of electromagnetic radiation
incomprehensibility resulting from obscurity of meaning
the quality of being opaque to a degree; the degree to which something reduces the passage of light
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for opacity come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.