[ oh-pas-i-tee ]
/ oʊˈpæs ɪ ti /

noun, plural o·pac·i·ties.

Origin of opacity

First recorded in 1550–60, opacity is from the Latin word opācitās shade. See opaque, -ity

Related forms

non·o·pac·i·ty, noun, plural non·o·pac·i·ties.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for opacity

British Dictionary definitions for opacity


/ (əʊˈpæsɪtɪ) /

noun plural -ties

the state or quality of being opaque
the degree to which something is opaque
an opaque object or substance
obscurity of meaning; unintelligibility
physics photog the ratio of the intensity of light incident on a medium, such as a photographic film, to that transmitted through the medium
logic philosophy the property of being an opaque context
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for opacity


[ ō-păsĭ-tē ]


The quality or state of being opaque.
An opaque or nontransparent area, as of the cornea.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.