
Aperture priority, often abbreviated A or Av (for aperture value) on a camera mode dial, is a setting on some cameras that allows the user to choose a specific aperture value while the camera selects a shutter speed to match, thereby ensuring proper exposure. This is different from manual mode, where the user must decide both values, shutter prior...
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http://en.wikipedia.org/wiki/Aperture_priority

(Digital cameras and photo printers) In this mode, the user can adjust the aperture and the camera automatically selects the best shutter speed to match it. In most cameras, the Aperture Priority mode is denoted by the letter “A�. Shutter Priority.
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http://www.encyclo.co.uk/local/20472

An exposure mode on an automatic or autofocus camera that lets you set the aperture while the camera sets the shutter speed for proper exposure. If you change the aperture, or the light level changes, the shutter speed changes automatically. Apart from the sport or action arena, aperture priority is the most common & effective automatic preference ...
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http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl

of or pertaining to a semiautomatic exposure system in which the photographer presets the aperture and the camera selects the shutter speed.
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https://www.infoplease.com/dictionary/aperture-priority
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