aperture

aperture [ AP-er-cher ]
 noun ]
 MEANING :
 1. a hole or opening
2. the adjustable opening in an optical instrument
 USAGE EXAMPLE 1 :
 When he peered through the aperture, he saw a strange world entirely different from the one in which he lived.
 USAGE EXAMPLE 2 :
 Nasa used such an approach, called coded aperture imaging, for the Swift satellite that was sent aloft to spot gamma ray sources.

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