American Heritage Dictionary
(4)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
The reason the greenhouse effect works is that at any given wavelength wherein the air has some finite opacity, the absorption / emission cross section of air at some level hides the radiation— RealClimate
At wavelengths where there is just sufficient opacity, the atmosphere looks like a surface on a large scale, although it will not radiate as a perfect blackbody because it is not isothermal across the visible depth - but at sufficiently high opacity, individual nearly-isothermal layers of air will act, radiatively, like surfaces.— RealClimate
By using opacity, the framework preserves the theme styling for the button but makes it appear to be dimmed out and unclickable.— doggdot.us
It would save a few moments of setting the opacity, and it auto-locks the layer.— Pixel2Life.com: Latest 15 Tutorials

American Heritage Dictionary (1)
Century Dictionary (1)
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