Concurrence/kənˈkɜːrəns/ Definition 1 of 3Pro Tip 1/2Not Cause and Effect The events occur together but one does not cause the other. The simultaneous concurrence of thunder and flashing lights startled everyone. Pro Tip 2/2Coincidental Timing Two events may happen at the same time by chance, with no link. A concurrence of a power outage and a storm made it seem related.