Opacity

A substance or object that is opaque is neither transparent nor translucent. It does not allow light to pass through it. The property of being opaque is called opacity. Degrees of opacity are converse to degrees of transparency.

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In science, the phrase "an opacity" may be used to describe an opaque object.

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In the humanities, "opacity" is a metaphor used in describing written or spoken language. Here opaque means confusing, unintelligible or unseen. In politics, governmental decision-making that is not conducted publicly may be called opaque. (See Transparency (humanities) and Transparency (linguistics).)

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In computer software, functions or data are opaque if they cannot be accessed or utilised.

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Transparent: REDIRECT Transparency and translucency...

Light: Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific setting, electromagnetic radiation of any wavelength. The three basic dimensions of light (i.e., all electromagnetic radiation) are:...

Metaphor: In language, a metaphor is a rhetorical trope defined as a direct comparison between two seemingly unrelated subjects. Typically, a first object is described as being or having the properties of a second object. In this way, the first object can be economically described because implicit and explici...