Aperture priority is marked on camera dials by the letters "AV", standing for aperture value. In this mode the photographer controls the aperture/F-Stop while the camera then resets shutter speed (and sometimes film speed) to maintain a midrange exposure.
This setting is very useful where the photographer knows that he/she wants either a large or small depth of field but the shutter speed is not important.
Source : http://photography.about.com
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