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in the PONS Dictionary

opac·ity [ə(ʊ)ˈpæsəti, Am oʊˈpæsət̬i] N no pl

1. opacity (non-transparency):

opacity
Opazität f <-> spec
opacity
Lichtundurchlässigkeit f

2. opacity fig:

opacity (obscurity)
Undurchsichtigkeit <->
opacity (incomprehensibility)
Unverständlichkeit f