Simultaneous; converging; of equal or joint authority.
Concurrent power is the authority of Congress and the state legislatures to make laws on the same subject matter while working independently of one another.
Concurrent negligence involves the negligent acts of at least two people that, although they might not have occurred at exactly the same moment, produce a single, indivisible injury.
Concurrent sentences are two or more prison terms to be served simultaneously, one of which might be longer than the others. The prisoner is entitled to be discharged after the longest of the terms is served.