{{Wiktionary|concurrency|concurrent|concurrence}} '''Concurrent''' means happening at the same time. '''Concurrency''', '''concurrent''', or '''concurrence''' may refer to: {{TOC right}} == 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
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