Concurrent means happening at the same time. Concurrency, concurrent, or concurrence may refer to:
Law Concurrence, in jurisprudence, the need to prove both actus reus and mens rea Concurring opinion (also called a "concurrence"), a legal opinion which supports the conclusion, though not always the reasoning, of the majority. Concurrent estate, a concept in property law Concurrent resolution, a legislative measure passed by both chambers of the United States Congress Concurrent sentences, in criminal law, periods of imprisonment that are served simultaneously
Computing Concurrency (computer science), the property of program, algorithm, or problem decomposition into order-independent or partially-ordered units Concurrent computing, the overlapping execution of multiple interacting computational tasks Concurrence (quantum computing), a measure used in quantum information theory Concurrent Computer Corporation, an American computer systems manufacturer Concurrent DOS, Digital Research's multiuser multitasking operating system, with "Concurrent" once being their registered trademark Concurrence, a presentation program designed by Lighthouse Design for NeXTSTEP which inspired Keynote by Apple
Engineering Concurrent engineering, an engineering methodology emphasizing the parallelisation of tasks Concurrent Design Facility, an assessment center of the European Space Agency using concurrent engineering methods
Other Concurrent lines, in geometry, multiple lines or curves intersecting at a single point Concurrency (road), an instance of one physical road bearing two or more different route numbers Concurrent (Easter), the weekday of 24 March Julian used to calculate Julian Easter Concurrent enrolment, a process in the US allowing students to enroll at a university or college while still in high school