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ope
OPEC
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opacity

o·pac·i·ty [ ō pássətee ]


noun 
Definition:
 
1. being opaque: the quality, condition, or degree of being opaque

2. obscurity: the quality of being obscure in meaning

3. photog physics ability of material to stop light: the capacity of a material such as photographic film to stop light, expressed as a comparison between light striking the material and light transmitted

4. philosophy propositions not adhering to Leibniz's law: propositions containing modal notions such as necessity or belief in which principles of logic such as Leibniz's law do not obtain

[Mid-16th century. Via French< Latin opacus "shaded, dark"]
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