Pronunciation: (kun-kûr'unt, -kur'-),[key] —adj. 1. occurring or existing simultaneously or side by side: concurrent attacks by land, sea, and air. 2. acting in conjunction; cooperating: the concurrent efforts of several legislators to pass the new law. 3. having equal authority or jurisdiction: two concurrent courts of law. 4. accordant or agreeing: concurrent testimony by three witnesses. 5. tending to or intersecting at the same point: four concurrent lines.
—n. 1. something joint or contributory.
2. Archaic.a rival or competitor.