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APEC
Apennines
aperçu
aperient
aperiodic
aperitif
aperture
aperture card
aperture priority
aperture stop
Apex
apex
Apgar score
aphaeresis
aphagia
aphakia
aphanite
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aperture priority
ap·er·ture pri·or·i·ty


noun 
Definition:
 
automatic selection of shutter speed: the system in a semiautomatic camera in which the user sets the lens aperture and the camera then selects the appropriate shutter speed automatically
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