Concurrent jurisdiction means that more than one court has the authority to hear a particular legal case. This allows multiple courts to have the power to handle the same type of case within a specific area or situation. Full definition
Typically state and tribal courts have concurrent jurisdiction over contractual disputes and neither party may be comfortable in those forums. (crowleyfleck.com)
I haven't checked the jurisprudence (most of which dates from the 1950s to 1970s) but my sense always was that this jurisdiction belonged to the Exchequer Court (latterly the Federal Court) with concurrent jurisdiction in the superior courts. (slaw.ca)
, Annual Report 2003, issued by Eurojust; Agreement for Handling Criminal Cases with Concurrent Jurisdiction between the United Kingdom and the United States of America, January 2007. (globalinvestigationsreview.com)