In optics, an aperture is a hole or an opening through which light travels.
Wikipedia
Hole or opening through which light travels
Wikidata
In photography, the camera lens opening and its relative diameter. Measured in f-stops, such as f/8, etc. As the number increases, the size of the aperture decreases, thereby reducing the amount of light passing through the lens and striking the film.
OmegaWiki
An opening, gap, or hole, usually small and narrow.
Wiktionary
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