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Definition of atrioventricular. : of, relating to, or located between an atrium and ventricle of the heart.
atrioventricular interval (AV interval). 1. PâR interval. 2. in dual chamber pacing, the length of time between the sensed or paced atrial event and the next sensed or paced ventricular event, measured in milliseconds; called also atrioventricular or AV delay.