Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: apertura, from aperire 'to open'

aperture

 noun
     
Related topics: Photography
ap‧er‧ture [countable]
1 formal a small hole or space in something
2TCP 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
Definition from the Longman Dictionary of Contemporary English
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