- At the same time - Happening in parallel - Synchronous - Take advantage of slipstream at the same time - Acting in conjunction; agreeing in the same act or
opinion; contributing to the same event or effect; cooperating. - Conjoined; associate; concomitant; existing or
happening at the same time. - Joint and equal in authority; taking cognizance of
similar questions; operating on the same objects; as, the concurrent
jurisdiction of courts.