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aperture

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aperture
aperture /ˈæpətʃə $ ˈæpərtʃʊr/ noun [countable]
 Date: 1600-1700
 Language: Latin
 Origin: apertura, from aperire 'to open'
1. formal a small hole or space in something
2. the small hole at the front of a camera, which can be made larger or smaller to let more or less light in when you take a photograph